CAS AS 101 Lecture Notes - Lecture 6: Celestial Equator, Northern Hemisphere, Night Sky
9 Feb 2018
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Longitude: position east or west of prime meridian (runs through greenwich, england) Every object on sphere appears to make daily circle. However, its motion looks more complex in local sky because horizon cuts the sphere in half. Circumpolar stars: near north celestial pole, remain always above horizon and never set. For someone in northpole, all stars are circumpolar. No stars rise or set, all stars are circumpolar. Every direction is to s, stars move to right or w -> counter clockwise. Sun up in sky for 6 months at the poles. Lies north of celestial equator for half of each year. Stars at 0 degree latitude rise due e, cross meridian at zenith and set due west. For latitude > 0 degree, rise of n of due e and set n of due w. Stars at high dec will be circumpolar. Stars at low dec will rise and set at an angle to your horizon.
