by APOD Robot » Wed Feb 12, 2020 5:05 am
Star Trails of the North and South
Explanation: What divides the north from the south? It all has to do with the spin of
the Earth. On Earth's surface,
the equator is the dividing line, but on Earth's sky, the dividing line is the
Celestial Equator -- the equator's projection onto the sky. You likely can't see the Earth's equator around you, but anyone with a
clear night sky can find the
Celestial Equator by watching stars move. Just
locate the dividing line between
stars that arc north and stars that arc south. Were you on Earth's equator, the Celestial Equator would go straight up and down.Â
In general, the angle between the Celestial Equator and the vertical is your
latitude. The featured image combines 325 photos taken every 30 seconds over 162 minutes. Taken soon after sunset earlier this month,
moonlight illuminates a snowy and desolate scene in northwest
Iran. The bright streak behind the
lone tree is the planet
Venus setting.
[url=https://apod.nasa.gov/apod/ap200212.html] [img]https://apod.nasa.gov/apod/calendar/S_200212.jpg[/img] [size=150]Star Trails of the North and South[/size][/url]
[b] Explanation: [/b] What divides the north from the south? It all has to do with the spin of [url=https://solarsystem.nasa.gov/planets/earth/overview/]the Earth[/url]. On Earth's surface, [url=https://www.nasa.gov/audience/forstudents/k-4/dictionary/Equator.html]the equator[/url] is the dividing line, but on Earth's sky, the dividing line is the [url=https://en.wikipedia.org/wiki/Celestial_equator]Celestial Equator[/url] -- the equator's projection onto the sky. You likely can't see the Earth's equator around you, but anyone with a [url=https://apod.nasa.gov/apod/ap180208.html]clear night sky[/url] can find the [url=https://www-istp.gsfc.nasa.gov/stargaze/Scelsph.htm]Celestial Equator[/url] by watching stars move. Just [url=https://en.wikipedia.org/wiki/Tracking_(dog)#/media/File:Male_Weimeraner_Following_a_Scent_Trail_in_the_Snow.jpg]locate the dividing line[/url] between [url=https://apod.nasa.gov/apod/ap190321.html]stars that arc[/url] north and stars that arc south. Were you on Earth's equator, the Celestial Equator would go straight up and down. [url=https://www.aa.quae.nl/en/antwoorden/hemel.html]In general[/url], the angle between the Celestial Equator and the vertical is your [url=https://c.tadst.com/gfx/750x500/longitude-and-latitude-simple.png]latitude[/url]. The featured image combines 325 photos taken every 30 seconds over 162 minutes. Taken soon after sunset earlier this month, [url=https://apod.nasa.gov/apod/ap170608.html]moonlight[/url] illuminates a snowy and desolate scene in northwest [url=https://en.wikipedia.org/wiki/Iran]Iran[/url]. The bright streak behind the [url=https://apod.nasa.gov/apod/ap200113.html]lone tree[/url] is the planet [url=https://apod.nasa.gov/apod/ap120508.html]Venus setting[/url][url=https://vimeo.com/37752523?autoplay-1#t=1m52s].[/url]
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