Joel E. Tohline, Alumni Professor

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ASTR Spring 2008 Joel E. Tohline, Alumni Professor 247 Nicholson Hall [Slides from Lecture10]

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Joel E. Tohline, Alumni Professor ASTR 1101-001 Spring 2008 Joel E. Tohline, Alumni Professor 247 Nicholson Hall [Slides from Lecture06]

What about the Dime? NOTE: A dime held 1 meter from your eye subtends an angle of 1°.

Star Trails …

… looking west!

Seasons …

Moon’s orbit around the Earth Responsible for our familiar calendar month. Period (of orbit) = 2.36 x 106 s = 27.32 days (Appendix 3). Moon’s orbital plane does not coincide with the ecliptic plane; it is inclined by approximately 8° to the ecliptic (§2-6). Much more about the Moon’s orbit in Chapter 3!