ASTR 170B2 Lecture Notes - Lecture 2: Astronomical Unit, Spiral Galaxy, Earth Radius

• School: University of Arizona
• Department: Astronomy
• Course: ASTR 170B2
• Professor: Dr. Tommi Koskinen

Document Summary

Astr ptys 170 b2 - lecture 2 - the earth and the cosmos cont. Lahaina noon: when the sun is straight overhead, no zenith angle. Example: it happens in hawaii and near the tropic of cancer during the northern. Review last weeks lecture notes for things on the zenith angle and the. If we assumed the earth was all gravel the mass would be too low. The earth rotates from west to east (counter clockwise viewing from the north pole) Latitude and longitude - grid of the earth. Longitude is from the equador, lines running east to west lying above and below equador. Latitude is from the prime meridian, lines running north to south lying to the right and left ot the prime meridian. Speed of rotation: at the poles it is 0 km/h, at the equador it is 1670 km/h. The earth"s orbit around the sun is an ellipse, the period is one year (365 days)