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Angular diameter
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==Estimating angular diameter using the hand== [[File:Estimating angular size with hand.gif|thumb|Approximate angles of 10Β°, 20Β°, 5Β°, and 1Β° for the hand outstretched at arm's length]] Estimates of angular diameter may be obtained by holding the hand at right angles to a [[Angular mil#Use|fully extended arm]], as shown in the figure.<ref>{{cite web |url=https://dept.astro.lsa.umich.edu/ugactivities/Labs/coords/index.html |title=Coordinate Systems|access-date=2015-01-21 |url-status=dead |archive-url=https://web.archive.org/web/20150121044615/https://dept.astro.lsa.umich.edu/ugactivities/Labs/coords/index.html |archive-date=2015-01-21 }}</ref><ref>{{cite web |url=https://www.bartbusschots.ie/s/2013/06/08/photographing-satellites/ |title=Photographing Satellites |date=8 June 2013 |url-status=live |archive-url=https://web.archive.org/web/20150121045706/https://www.bartbusschots.ie/s/2013/06/08/photographing-satellites/ |archive-date=21 January 2015 }}</ref><ref>[[v:Physics and Astronomy Labs/Angular size|Wikiversity: Physics and Astronomy Labs/Angular size]]</ref>
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