ASTR 170B2 Study Guide - Comprehensive Final Exam Guide - Earth, Sun, Orbit

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

Document Summary

Astr ptys 170 b2 - lecture 1 - the earth and the cosmos. In some places on earth, the sun does not set. Like finland for example, half of the country experiences this when the sun gets low to set but never goes below the horizon before rising again. Distance from tucson az to finland: 8750km. Tucson to dallas /fort worth - time: 2 h 14 m. Dallas/ fort worth to new york - time 3h 31 m. New york to helsinki - time 8 h 5 min. In the class we will use mks units (meters, grams, and seconds) 1 mile = 1. 6 km or 1,600 m. 1 lb = 0. 45 kg 0r 450 m. Zenith angles and the size of the earth. The size of the earth was first determined in 230 bc egypt. Erastothenes of cyrene determined the size of the earth in about 230 bc by comparing the solar noon zenith angle in alexandria and syene.