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| Description: Positions in the Sky Equatorial system of location A coordinate system that divides the celestial sphere Similar to the latitude-longitude system that is used on Earth’s surface Two locational components Declination – the angular distance north or south of the celestial equator Right ascension – the angular distance measured eastward along the celestial equator from the position of the vernal equinox Earth Motions Two primary motions Rotation Turning, or spinning, of a body on its axis Two measurements for rotation Mean solar day – the time interval from one noon to the next, about 24 hours Sidereal day – the time it takes for Earth to make one complete rotation (360°) with respect to a star other than the Sun – 23 hours, 56 minutes, 4 seconds Picture Stats: Views: 345 Filesize: 399.15kB Height: 507 Width: 1398 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39654 |