Astro 10-Lecture 3: Seasons, Phases of the Moon and Eclipses

2/1/2004


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Table of Contents

Astro 10-Lecture 3: Seasons, Phases of the Moon and Eclipses

The Celestial Sphere

The Celestial Sphere

Concept Test

Another line on the celestial sphere

The Earthís 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

The orbits of the other planets are also in the ecliptic plane

Precession

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

Tilt Model

Tilt Model

Tilt Model

Tilt Model

Tilt Model

Tilt Model

The Moon: The Earthís Companion

The Moon: The Earthís Companion

Phases of the Moon

Phases of the Moon

Why do we see phases?

Moon rotates to keep same face toward the Earth

Eclipses

Eclipses: Lunar

Eclipses: Lunar

Eclipses: Lunar

Eclipses: Solar (Partial)

Eclipses: Solar (Total)

Eclipses: Solar (Total)

Eclipses: Solar (Total)

Eclipses: Solar

Eclipses: Solar (Annular)

Eclipses: Solar (Annular)

Eclipses can only happen at certain phases of the moon.

Then why donít we have eclipses every month?

Concept Test

Then why donít we have eclipses every month?

Author: Eric J Korpela

Email: korpela at ssl.berkeley.edu

Home Page: http://setiathome.ssl.berkeley.edu/~korpela/