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'/'+path : ''; window.lastHistory = '/'+path; } } }); $('.tabtrigger li a').live('click', ensure(function() { var tab = $(this).attr('id'); if(tab.substring(0,1) == '#'){ var name = tab.substring(1); if(name in menu_names){ name = menu_names[name][0]; } realTab = rev_names[name]; $('#'+realTab).show(); if(window.console && console.log) console.log("Triggering tab: "+name+(window.activeArea?" activeArea="+window.activeArea:'')); var path = name; if(window.activeArea){ path = path + '/' + window.activeArea; } if(tab.match(/#playlist\d+/) || tab.match(/#details\d+/)){ $('.multiple-playlists').show(); $('.related_playlist').show(); $('.longest_videos_playlist').show(); }else { $('.multiple-playlists').hide(); $('.related_playlist').hide(); $('.longest_videos_playlist').hide(); } // start the related script only when the tab is on screen showing if (tab.match(/related_sites/)) { if (mc) { mc.startCredits(); } } window.activeTab = realTab; addHistory(path); setTimeout(ensure(function(){ if(tab.match(/language--/)){ $('.tabtrigger').offscreentabs('activateTab', 'language'); } if(tab.match(/weather/)) { $('.tabtrigger').offscreentabs('activateTab', 'weather'); loadContinent(); } updateMenus(tab); updateHeight(); }), 10); } return false; })); }); -->

Ejnar Hertzsprung

Ejnar Hertzsprung (Danish pronunciation: [ɑjnɐ ˈhæɐ̯d̥sb̥ʁɔŋ], 8 October 1873 – 21 October 1967) was a Danish chemist and astronomer, born in Copenhagen, Denmark. In the period 1911–1913, together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram.

In 1913 he determined the distances to several Cepheid variable stars by statistical parallax, and was thus able to calibrate the relationship discovered by Henrietta Leavitt between Cepheid period and luminosity. In this determination he made a mistake, possibly a slip of the pen, putting the stars 10 times too close. He used this relationship to estimate the distance to the Small Magellanic Cloud. From 1919 to 1946 Hertzsprung worked at Leiden Observatory in the Netherlands, from 1937 as director. Among his graduate students at Leiden was Gerard Kuiper.

Perhaps his greatest contribution to astronomy was the development of a classification system for stars to divide them by spectral type, stage in their development, and luminosity. The so-called "Hertzsprung–Russell Diagram" has been used ever since as a classification system to explain stellar types and stellar evolution. He also discovered two asteroids, one of which is 1627 Ivar, an Amor asteroid.

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'); } else { var query = elem.find('.keywords').html(); $.ajax({ context: elem, url: 'https://wn.com/api/upge/cheetah-search-adv/video', cache: true, data: { 'query': query }, dataType: 'jsonp', success: function(text) { if (text.length > 0) { video_id = text[0].id; elem.find('.player').html(''); } } }); } } var stopAllYouTubeVideos = function() { var iframes = document.querySelectorAll('iframe'); Array.prototype.forEach.call(iframes, function(iframe) { iframe.contentWindow.postMessage(JSON.stringify({ event: 'command', func: 'pauseVideo' }), '*'); }); } jQuery(function() { jQuery(".playVideo").live("click", function() { if(!$(this).hasClass("played")){ stopAllYouTubeVideos(); var elem = $(this); setTimeout(function(){ mouseOverMe(elem); }, 1000); } }); jQuery(".description_box .expandContent").live("click", function() { elem = $(this).parent().parent().parent().find('.descContent'); if(elem.height() > 51) { elem.css('height', '44px'); $(this).html('Show More '); }else{ elem.css('height', 'auto'); $(this).html('Hide '); } }); jQuery('.interview-play-off').click(function() { $(".interview-play-off").hide(); $(".interview-play").show(); $(".videoplayer-control-pause").click(); }); jQuery(".video-desc .show_author_videos").live("click", function() { query = $(this).attr('title'); container = $(this).parent().parent().parent().find('.video-author-thumbs'); $(this).parent().parent().parent().find('.video-author-thumbs').css('height', '220px'); jQuery.ajax({ url: '/api/upge/cheetah-photo-search/videoresults', data: {'query': query}, success: function(text) { if(!text) { text = i18n("No results"); } container.html(jQuery(text)); } }); }); }); // -->

Latest News for: ejnar hertzsprung

Edit

It’s been 100 years since we learned the Milky Way is not the only galaxy

Alternet 22 Nov 2024
The headline read. Finds Spiral Nebulae are Stellar Systems ... Henrietta Swan Leavitt ... The Danish researcher Ejnar Hertzsprung used stellar parallax to obtain the distances to a handful of nearby Cepheid stars, helping calibrate Leavitt’s work ... .
Edit

It’s 100 years since we learned the Milky Way is not the only galaxy

The Conversation 20 Nov 2024
The headline read. Finds Spiral Nebulae are Stellar Systems ... Henrietta Swan Leavitt ... The Danish researcher Ejnar Hertzsprung used stellar parallax to obtain the distances to a handful of nearby Cepheid stars, helping calibrate Leavitt’s work ... .
Edit

Skywatch: Astronomical tape measures

Pioneer Press 14 Jul 2024
One method is the famous Hertzsprung-Russel diagram, developed in the early 1900s by Ejnar Hertzsprung of Holland and Henry Norris Russel from the United States ... Hertzsprung and Russel found a definite ...
Edit

Polaris is the closest, brightest cepheid variable. Very recently, something changed

Phys Dot Org 11 Sep 2023
When you look up in the night sky and find your way to the North Star, you are looking at Polaris ... The variable nature of Polaris was confirmed in 1911 by Danish astronomer Ejnar HertzsDaprung, for whom the HertzsprungRussell diagram is partly named.
Edit

U.S. Naval Observatory’s great refractor turns 150 years old

Astronomy 07 Feb 2023
From martian moons to double stars, this historic telescope made its mark on the field ... size ... Strand, who became the observatory’s scientific director in 1963, had been trained by Ejnar Hertzsprung in the use of photography for measuring doubles.
Edit

Skywatch: How do we know how far away the stars are?

Pioneer Press 14 Aug 2022
Over a hundred years ago, astronomers could get a pretty good estimate of distance using the famous Hertzsprung-Russel diagram, developed in the early 20th century by Ejnar Hertzsprung of Holland and Henry Norris Russel from the United States.
Edit

How we know how far away the stars are

Post Bulletin 12 Aug 2022
Over a hundred years ago, astronomers could get a pretty good estimate of distance using the famous Hertzsprung-Russel diagram, developed in the early 20th century by Ejnar Hertzsprung of Holland and Henry Norris Russel from the United States.
Edit

Thanks to Gaia we Know Exactly how and When the Sun Will die

Universe Today 12 Aug 2022
First as a data table by Ejnar Hertzsprung in 1905, but more famously done as a diagram by Henry Norris Russell in 1914. Now known as Hertzsprung-Russell diagrams, or HR diagrams, they plot the color ...
Edit

Gaia mission reveals the past and future of the sun

Phys Dot Org 11 Aug 2022
Devised independently in 1911 by Ejnar Hertzsprung and in 1913 by Henry Norris Russell,a HR diagram plots a star's intrinsic luminosity against its effective surface temperature.
Edit

The star that changed the cosmos: M31-V1

Astronomy 09 Aug 2022
Danish astronomer Ejnar Hertzsprung realized the tremendous significance of Leavitt’s discovery ... But Hertzsprung’s early attempts at calibration were crude at best, yielding a distance to ...
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