CSS px is an Angular Measurementby Sean B. Palmer The “px†unit in CSS doesn't really have anything to do with screen pixels, despite the poorly chosen name. It's actually an non-linear angular measurement. The formulæ to convert between radians and px are as follows: radians = arctan(px/5376) * 2 px = 5376 * tan(radians/2) Using this, you can work out the apparent angular widths of things in pixels quite easily. The moon from e
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