A sextant is a doubly reflecting navigation instrument used to measure the angle between any two visible objects. The principle of the instrument was first implemented around 1730 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749) but it was also found later in the unpublished writings of Isaac Newton (1643–1727). The history of these and related instruments, and their forerunners, may be found in the article on reflecting instruments.
The primary use of a sextant is to determine the angle between an astronomical object and the horizon for the purposes of celestial navigation. The determination of this angle, the altitude, is known as sighting (or shooting) the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon or Polaris at night (in the Northern Hemisphere) to determine latitude. Sighting the height of a landmark can give a measure of distance off and, held horizontally, a sextant can measure angles between objects for a position on a chart. A sextant can also be used to measure the lunar distance between the moon and another celestial object (such as a star or planet) in order to determine Greenwich Mean Time and hence longitude.
Sextants for astronomical observations were devices depicting a sixth of a circle, used primarily for measuring the positions of stars. They are of significant historical importance, but have been replaced over time by transit telescopes, astrometry techniques, and satellites such as Hipparcos.
There are two types of astronomical sextants, mural instruments and frame-based instruments.
Mural sextants
Mural sextants are a special case of a mural instrument. Many were made that were quadrants rather than sextants. They were a kind of specialty of medieval Muslim astronomers, to whom the credit of building the first mural sextants is attributed.
The first known mural sextant was constructed in Ray, Iran, by Abu-Mahmud al-Khujandi in 994. To measure the obliquity of the ecliptic, al-Khujandī invented a device that he called al-Fakhri sextant (al-suds al Fakhrī), a reference to his patron, Buwayhid ruler, Fakhr al Dawla (976-997). This instrument was a sixty-degree arc on a wall aligned along a meridian arc (north-south line). Al Khujandi’s instrument was larger than previous instruments; it had a radius of about twenty meters. The main improvement incorporated in al-Fakhri sextants over earlier instruments was bringing the precision of reading to seconds while older instruments could only be read in degrees and minutes. This was confirmed by al-Birūni, al-Marrākushī and al-Kāshī. Al-Khujandī used his device to measure the sun's angle above the horizon at the summer and winter solstices; these two measurements allow to compute the latitude of the sextant's location and the obliquity of the ecliptic.
Released in March 30, 1973 but recorded in 1972, Sextant was Herbie Hancock's first album on Columbia Records. It was a complex, harmonically and rhythmically challenging musical statement. Hancock was no stranger to electronic music, having used synthesisers extensively during his short time with Warner Bros. Records, but Sextant took his sound to a new level.
While a select few praised his new approach, Hancock alienated the bulk of his audience, who found his sound extremely inaccessible. Made up of just three tracks, the funkier elements of tracks such as "Hornets", also point toward the commercial success he would enjoy in the 80s with Future Shock and Sound-System, among others.
Hancock's first recording on Columbia would be his last recording with his Mwandishi-era group, with Sextant's poor album sales influencing his move into more mainstream music with Head Hunters.
Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a sextant. The video is part of the "Finding Our Way: Exploring Human Navigation" exhibition at Harvard's Collections of Scientific Instruments.
published: 03 Feb 2015
Sextant Tutorial: The Principle of the Sextant
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/peGY
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the first in a series which will teach you how the sextant works and how you can use it.
This video covers Parts of the Sextant, and the Sextant's Operational Principle.
The next video will cover Sextant Errors and Methods of Corrections.
The final video will cover T...
published: 29 Jul 2019
Sextant Tutorial: Taking Sights With A Sextant
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/rFFEB
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the third in a series which will teach you how the sextant works and how you can use it.
This video covers actually using the sextant to take sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan ...
published: 31 Jul 2019
Sextant Tutorial: Errors and Corrections
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/LtZwI
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the second in a series which will teach you how the sextant works and how you can use it.
This video covers Sextant Errors and Corrections. We will look at:
Index Error
Side Error
Perpendicularity Error
Instrument Error
Prismatic Error
Worm and Rack Error
Graduation Er...
published: 30 Jul 2019
Getting Started in Celestial Navigation (The Marine Sextant)
Free and discount marine navigation courses: https://www.practicalnavigator.org/
This video is part 1 of the "Getting Started in Celestial Navigation" video series.
Part 1 of "Getting Started in Celestial Navigation," (The Marine Sextant) describes the marine sextant, it's parts, and how to measure the angle from the horizon to the sun. It also introduces the concepts of "limbs" and how to read the sextant.
Here are some additional resources pertaining to this lesson:
1. Wikipedia "Sextant" - http://en.wikipedia.org/wiki/Sextant
2. How to build a simple sextant - http://www.tecepe.com.br/nav/CDSextantProject.htm
3. Artificial horizons - http://www.sailingmagazine.net/how-to/technique/620-celestial-navigation-.html
Navigation Materials
All example problems in this course use the...
published: 06 Apr 2013
Sextant
Provided to YouTube by Back Lot Music, a division of Universal Studios LLLP
Sextant · Justin Hurwitz
First Man (Original Motion Picture Soundtrack)
℗ 2018 Back Lot Music, a division of Universal Studios Music LLLP
Released on: 2018-10-12
Studio Personnel: Chris Bellman
Main Artist: Justin Hurwitz
Producer: Justin Hurwitz
Studio Personnel: Newman Scoring Stage, Fox Studios, Los Angeles
Studio Personnel: Streisand Scoring Stage, Sony Pictures Studios, Los Angeles
Composer: Justin Hurwitz
Music Publisher: UPG Music Publishing (BMI)
Auto-generated by YouTube.
published: 27 Feb 2020
Can You Really FIND Your COORDINATES With a SEXTANT? | Sailing Wisdom
The first 1,000 people to use this link will get a 1 month free trial of Skillshare: https://skl.sh/riggingdoctor08211
0:00 Intro
0:40 What you need
0:56 Noonsight
1:14 The Example Information
1:29 Longitude Calculation
3:45 Latitude Calculation
8:00 Discussion of other methods
10:00 Skillshare
Nautical Almanac: https://amzn.to/3xrTrdd
Sextant: https://amzn.to/3juK33y
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published: 06 Aug 2021
Sextant review harbor fright
published: 07 May 2022
V072 Sextant : LIFE AT SEA
This is a sextant which merchant mariners use to locate the own vessels position.
Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a sextant. The video is part of the "Finding Our Way: Explorin...
Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a sextant. The video is part of the "Finding Our Way: Exploring Human Navigation" exhibition at Harvard's Collections of Scientific Instruments.
Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a sextant. The video is part of the "Finding Our Way: Exploring Human Navigation" exhibition at Harvard's Collections of Scientific Instruments.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime train...
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/peGY
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the first in a series which will teach you how the sextant works and how you can use it.
This video covers Parts of the Sextant, and the Sextant's Operational Principle.
The next video will cover Sextant Errors and Methods of Corrections.
The final video will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/peGY
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the first in a series which will teach you how the sextant works and how you can use it.
This video covers Parts of the Sextant, and the Sextant's Operational Principle.
The next video will cover Sextant Errors and Methods of Corrections.
The final video will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime train...
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/rFFEB
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the third in a series which will teach you how the sextant works and how you can use it.
This video covers actually using the sextant to take sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/rFFEB
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the third in a series which will teach you how the sextant works and how you can use it.
This video covers actually using the sextant to take sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime train...
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/LtZwI
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the second in a series which will teach you how the sextant works and how you can use it.
This video covers Sextant Errors and Corrections. We will look at:
Index Error
Side Error
Perpendicularity Error
Instrument Error
Prismatic Error
Worm and Rack Error
Graduation Error
Centering Error
Collimation Error
In the next video, we will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/LtZwI
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the second in a series which will teach you how the sextant works and how you can use it.
This video covers Sextant Errors and Corrections. We will look at:
Index Error
Side Error
Perpendicularity Error
Instrument Error
Prismatic Error
Worm and Rack Error
Graduation Error
Centering Error
Collimation Error
In the next video, we will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
Free and discount marine navigation courses: https://www.practicalnavigator.org/
This video is part 1 of the "Getting Started in Celestial Navigation" video ...
Free and discount marine navigation courses: https://www.practicalnavigator.org/
This video is part 1 of the "Getting Started in Celestial Navigation" video series.
Part 1 of "Getting Started in Celestial Navigation," (The Marine Sextant) describes the marine sextant, it's parts, and how to measure the angle from the horizon to the sun. It also introduces the concepts of "limbs" and how to read the sextant.
Here are some additional resources pertaining to this lesson:
1. Wikipedia "Sextant" - http://en.wikipedia.org/wiki/Sextant
2. How to build a simple sextant - http://www.tecepe.com.br/nav/CDSextantProject.htm
3. Artificial horizons - http://www.sailingmagazine.net/how-to/technique/620-celestial-navigation-.html
Navigation Materials
All example problems in this course use the 1981 Training Nautical Almanac and HO229 (there are no example problems in this lesson).
1. The 1981 Nautical Almanac
Hardcopy 1981 Training Nautical Almanac - http://www.amazon.com/The-Nautical-Almanac-1981-Training/dp/0914025260
Note you can also download for free or minimal price online by searching google, for example https://ebookpie.com/ebooks/300803-the-nautical-almanac-1981-for-training-purposes-only. You can download it from lapware.com if you pay the monthly fee for access. Sidenote - lapware is an amazing training tool!
2. HO229 - Sight Reduction Tables for Marine Navigation
Free download - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0013
3. Other materials of use
Free download of Bowditch (The American Practical Navigator) - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0002
USCG licensing website. This contains all the possible questions on USCG exams - http://www.uscg.mil/nmc/training/exams/deck/default.asp
The book I used to learn celestial navigation myself, and I think one of the best celestial navigation books out there, is "Common Sense Celestial Navigation" by Hewitt Schlereth - https://amzn.to/2O8evTa
Produced and presented by Christopher D. Nolan, USCG cutterman (8 years) and US merchant mariner (1600 ton Oceans).
Free and discount marine navigation courses: https://www.practicalnavigator.org/
This video is part 1 of the "Getting Started in Celestial Navigation" video series.
Part 1 of "Getting Started in Celestial Navigation," (The Marine Sextant) describes the marine sextant, it's parts, and how to measure the angle from the horizon to the sun. It also introduces the concepts of "limbs" and how to read the sextant.
Here are some additional resources pertaining to this lesson:
1. Wikipedia "Sextant" - http://en.wikipedia.org/wiki/Sextant
2. How to build a simple sextant - http://www.tecepe.com.br/nav/CDSextantProject.htm
3. Artificial horizons - http://www.sailingmagazine.net/how-to/technique/620-celestial-navigation-.html
Navigation Materials
All example problems in this course use the 1981 Training Nautical Almanac and HO229 (there are no example problems in this lesson).
1. The 1981 Nautical Almanac
Hardcopy 1981 Training Nautical Almanac - http://www.amazon.com/The-Nautical-Almanac-1981-Training/dp/0914025260
Note you can also download for free or minimal price online by searching google, for example https://ebookpie.com/ebooks/300803-the-nautical-almanac-1981-for-training-purposes-only. You can download it from lapware.com if you pay the monthly fee for access. Sidenote - lapware is an amazing training tool!
2. HO229 - Sight Reduction Tables for Marine Navigation
Free download - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0013
3. Other materials of use
Free download of Bowditch (The American Practical Navigator) - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0002
USCG licensing website. This contains all the possible questions on USCG exams - http://www.uscg.mil/nmc/training/exams/deck/default.asp
The book I used to learn celestial navigation myself, and I think one of the best celestial navigation books out there, is "Common Sense Celestial Navigation" by Hewitt Schlereth - https://amzn.to/2O8evTa
Produced and presented by Christopher D. Nolan, USCG cutterman (8 years) and US merchant mariner (1600 ton Oceans).
Provided to YouTube by Back Lot Music, a division of Universal Studios LLLP
Sextant · Justin Hurwitz
First Man (Original Motion Picture Soundtrack)
℗ 2018 Ba...
Provided to YouTube by Back Lot Music, a division of Universal Studios LLLP
Sextant · Justin Hurwitz
First Man (Original Motion Picture Soundtrack)
℗ 2018 Back Lot Music, a division of Universal Studios Music LLLP
Released on: 2018-10-12
Studio Personnel: Chris Bellman
Main Artist: Justin Hurwitz
Producer: Justin Hurwitz
Studio Personnel: Newman Scoring Stage, Fox Studios, Los Angeles
Studio Personnel: Streisand Scoring Stage, Sony Pictures Studios, Los Angeles
Composer: Justin Hurwitz
Music Publisher: UPG Music Publishing (BMI)
Auto-generated by YouTube.
Provided to YouTube by Back Lot Music, a division of Universal Studios LLLP
Sextant · Justin Hurwitz
First Man (Original Motion Picture Soundtrack)
℗ 2018 Back Lot Music, a division of Universal Studios Music LLLP
Released on: 2018-10-12
Studio Personnel: Chris Bellman
Main Artist: Justin Hurwitz
Producer: Justin Hurwitz
Studio Personnel: Newman Scoring Stage, Fox Studios, Los Angeles
Studio Personnel: Streisand Scoring Stage, Sony Pictures Studios, Los Angeles
Composer: Justin Hurwitz
Music Publisher: UPG Music Publishing (BMI)
Auto-generated by YouTube.
The first 1,000 people to use this link will get a 1 month free trial of Skillshare: https://skl.sh/riggingdoctor08211
0:00 Intro
0:40 What you need
0:56 Noons...
The first 1,000 people to use this link will get a 1 month free trial of Skillshare: https://skl.sh/riggingdoctor08211
0:00 Intro
0:40 What you need
0:56 Noonsight
1:14 The Example Information
1:29 Longitude Calculation
3:45 Latitude Calculation
8:00 Discussion of other methods
10:00 Skillshare
Nautical Almanac: https://amzn.to/3xrTrdd
Sextant: https://amzn.to/3juK33y
Patreon: https://www.patreon.com/riggingdoctor
Channel Membership: https://www.youtube.com/channel/UCSG2rLXWSP-nG0jCMGoT3lg/join
Merchandise: https://teespring.com/stores/rigging-doctor
Instagram: https://www.instagram.com/riggingdoctor
Facebook: https://www.facebook.com/sailingwisdom
Website: https://www.riggingdoctor.com
Paintings: [email protected]
Amazon: https://www.amazon.com/shop/riggingdoctor
The first 1,000 people to use this link will get a 1 month free trial of Skillshare: https://skl.sh/riggingdoctor08211
0:00 Intro
0:40 What you need
0:56 Noonsight
1:14 The Example Information
1:29 Longitude Calculation
3:45 Latitude Calculation
8:00 Discussion of other methods
10:00 Skillshare
Nautical Almanac: https://amzn.to/3xrTrdd
Sextant: https://amzn.to/3juK33y
Patreon: https://www.patreon.com/riggingdoctor
Channel Membership: https://www.youtube.com/channel/UCSG2rLXWSP-nG0jCMGoT3lg/join
Merchandise: https://teespring.com/stores/rigging-doctor
Instagram: https://www.instagram.com/riggingdoctor
Facebook: https://www.facebook.com/sailingwisdom
Website: https://www.riggingdoctor.com
Paintings: [email protected]
Amazon: https://www.amazon.com/shop/riggingdoctor
Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a sextant. The video is part of the "Finding Our Way: Exploring Human Navigation" exhibition at Harvard's Collections of Scientific Instruments.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/peGY
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the first in a series which will teach you how the sextant works and how you can use it.
This video covers Parts of the Sextant, and the Sextant's Operational Principle.
The next video will cover Sextant Errors and Methods of Corrections.
The final video will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/rFFEB
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the third in a series which will teach you how the sextant works and how you can use it.
This video covers actually using the sextant to take sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
✔ Casual Animation is all about creating engaging content for education and training.
✔ This video is an example of content that we produce for maritime training providers. To purchase a copy to use yourself visit: https://gum.co/LtZwI
----------ABOUT THE VIDEO----------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
The sextant is one of the fundamental navigational instruments. Once you have mastered it, you can navigate the world without the need for a GPS.
This video is the second in a series which will teach you how the sextant works and how you can use it.
This video covers Sextant Errors and Corrections. We will look at:
Index Error
Side Error
Perpendicularity Error
Instrument Error
Prismatic Error
Worm and Rack Error
Graduation Error
Centering Error
Collimation Error
In the next video, we will cover Taking Sights.
-----OTHER TOPICS WE COVER-----
Consider subscribing to the channel if you are interested in any other topics we plan to cover:
✔ Behind the scenes of my other channel, Casual Navigation.
✔ Tutorials about creating engaging content for education and training.
----------DISCLAIMER----------
This video should not be considered professional advice or education.
We try to make the content as accurate as possible, but the responsibility rests with the viewer to determine the full accuracy and reliability of the content.
Any action you take as a result of watching this video is strictly at your own risk.
Free and discount marine navigation courses: https://www.practicalnavigator.org/
This video is part 1 of the "Getting Started in Celestial Navigation" video series.
Part 1 of "Getting Started in Celestial Navigation," (The Marine Sextant) describes the marine sextant, it's parts, and how to measure the angle from the horizon to the sun. It also introduces the concepts of "limbs" and how to read the sextant.
Here are some additional resources pertaining to this lesson:
1. Wikipedia "Sextant" - http://en.wikipedia.org/wiki/Sextant
2. How to build a simple sextant - http://www.tecepe.com.br/nav/CDSextantProject.htm
3. Artificial horizons - http://www.sailingmagazine.net/how-to/technique/620-celestial-navigation-.html
Navigation Materials
All example problems in this course use the 1981 Training Nautical Almanac and HO229 (there are no example problems in this lesson).
1. The 1981 Nautical Almanac
Hardcopy 1981 Training Nautical Almanac - http://www.amazon.com/The-Nautical-Almanac-1981-Training/dp/0914025260
Note you can also download for free or minimal price online by searching google, for example https://ebookpie.com/ebooks/300803-the-nautical-almanac-1981-for-training-purposes-only. You can download it from lapware.com if you pay the monthly fee for access. Sidenote - lapware is an amazing training tool!
2. HO229 - Sight Reduction Tables for Marine Navigation
Free download - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0013
3. Other materials of use
Free download of Bowditch (The American Practical Navigator) - http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0002
USCG licensing website. This contains all the possible questions on USCG exams - http://www.uscg.mil/nmc/training/exams/deck/default.asp
The book I used to learn celestial navigation myself, and I think one of the best celestial navigation books out there, is "Common Sense Celestial Navigation" by Hewitt Schlereth - https://amzn.to/2O8evTa
Produced and presented by Christopher D. Nolan, USCG cutterman (8 years) and US merchant mariner (1600 ton Oceans).
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Sextant · Justin Hurwitz
First Man (Original Motion Picture Soundtrack)
℗ 2018 Back Lot Music, a division of Universal Studios Music LLLP
Released on: 2018-10-12
Studio Personnel: Chris Bellman
Main Artist: Justin Hurwitz
Producer: Justin Hurwitz
Studio Personnel: Newman Scoring Stage, Fox Studios, Los Angeles
Studio Personnel: Streisand Scoring Stage, Sony Pictures Studios, Los Angeles
Composer: Justin Hurwitz
Music Publisher: UPG Music Publishing (BMI)
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0:00 Intro
0:40 What you need
0:56 Noonsight
1:14 The Example Information
1:29 Longitude Calculation
3:45 Latitude Calculation
8:00 Discussion of other methods
10:00 Skillshare
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A sextant is a doubly reflecting navigation instrument used to measure the angle between any two visible objects. The principle of the instrument was first implemented around 1730 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749) but it was also found later in the unpublished writings of Isaac Newton (1643–1727). The history of these and related instruments, and their forerunners, may be found in the article on reflecting instruments.
The primary use of a sextant is to determine the angle between an astronomical object and the horizon for the purposes of celestial navigation. The determination of this angle, the altitude, is known as sighting (or shooting) the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon or Polaris at night (in the Northern Hemisphere) to determine latitude. Sighting the height of a landmark can give a measure of distance off and, held horizontally, a sextant can measure angles between objects for a position on a chart. A sextant can also be used to measure the lunar distance between the moon and another celestial object (such as a star or planet) in order to determine Greenwich Mean Time and hence longitude.
Sextant's lineup came together pretty much by happenstance, when at short notice Tomkins was asked to assemble a band for a pub gig and called on five friends.