ASTR 105 Lecture Notes - Lecture 2: Retrograde And Prograde Motion, Constellation, Celestial Coordinate System
Document Summary
Depending on where you are the parts of the sky that you see are very different. Zodiac constellations are ones in which the sun travels through. Go to the very top of the handle. Go out 5 lengths from the tip. If you look straight up in the sky it is called your zenith. Earths rotation causes stars motion in the sky. Time zones are based off of earths rotation. Solstice when a hemisphere is receiving the most or least radiation. Earths tilt on its axis is what causes seasons. The greater the axis tilt the more extreme the seasons are. A coordinate system for the sky consisting of . During a year the sun follows the elliptic travelling through the constellations. We always see the same side of the moon. We see it at different times of the day. Its features (dark spots) always look the same. Phases occur because the moon orbits earth.
