Astro 10-Lecture 3: Seasons, Phases of the Moon and Eclipses
The Celestial Sphere
Concept Test
Another line on the celestial sphere
The Earth’s pole is tilted with respect to the ecliptic
The sun appears to travels along the ecliptic over the course of the year
The orbits of the other planets are also in the ecliptic plane
Precession
Defining Seasons
Models of Possible Causes
Choosing a Model
Preferring a Model
Ruling out a Model
The orbit of the Earth
Ruling out another Model
Tilt Model
The size of the Earth
The Moon: The Earth’s Companion
Phases of the Moon
Why do we see phases?
Moon rotates to keep same face toward the Earth
Eclipses
Eclipses: Lunar
Eclipses: Solar (Partial)
Eclipses: Solar (Total)
Eclipses: Solar
Eclipses: Solar (Annular)
Eclipses can only happen at certain phases of the moon.
Then why don’t we have eclipses every month?
Email: korpela at ssl.berkeley.edu
Home Page: http://setiathome.ssl.berkeley.edu/~korpela/