AST 2002 Chapter Notes - Chapter 2: Solar Time, International Astronomical Union, Angular Diameter
Document Summary
A constellation is a region of the night sky and is given clear borders. Chapter 2 discovering the universe for yourself. Why can we only see certain constellations at certain times of the year: the north-south measurement position is latitude, while the east-west position is longitude, only latitude varies the local sky because it effects the horizon and zenith. People at the same latitude in different cities see the same constellations: your latitude is equal to the celestial pole"s altitude above the horizon in your sky, the zodiac is the constellations that lie on the ecliptic. There are actually 13 constellations as part of this in contrary to the popular belief of 12: we can only see certain constellations at night because of our position as we orbit the sun. In june, the north is towards the sun while the south is tipped away.
