AS101 Lecture Notes - Lecture 3: Celestial Equator, Right Ascension, Leap Year
Document Summary
Latitude is called declination and longitude is called right ascension. Expanding latitude and longitude lines onto the celestial sphere provides a coordinate grid on the sky determining position of stars. Declination is expressed in degrees, arcminutes, and arcseconds north or south of the celestial equator. The brightest star in the constellation auriga cappella has a declination of. Right ascension is expressed in hours, minutes, and seconds: the celestial sphere takes 24 hours to complete a turn around earth, zero of right ascension is the longitudinal line that runs through the spring equinox. The right ascension of capella is 5 hours and 15 minutes east of the spring equinox. Solar time is determined by the suns position in the sky relative to the local meridian. Ante meridian is where the sun does not reach the meridian yet. Post meridian is where the sun passes the meridian.
