ASTRON 103 Chapter Notes - Chapter 7: Solar Time, Sidereal Time, Standard Tuning
5 Oct 2016
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One day = one rotation of earth: length of day set by earth"s rotation speed. Terms: apparent noon: time when sun crosses the meridian as seen from particular location. Differs from 12pm on clock at different parts of the year. There is a better way to mark time since time from sunrise to sunset changes throughout the year. Solar day: time interval from one noon to the next noon. Not always 24 hours, so we use the mean solar day to: a. m, p. m keep time. Ante meridian (before the sun crosses the meridian) Past meridian (after the sun crosses the meridian) Meridian: line that divides eastern & western halves of the sky. Passes through zenith (directly overhead: sidereal day: length of time from rising of a star until it next rises. Shorter because don"t have extra time seen in solar day due to.
