Video Tutorials Seasons explanation and simulation Seasons Interactive Phases of the moon Phases of the moon real images Observe solar eclipses What's the difference between a solar and lunar eclipse explains why we don't see solar eclipses 13 times a year lunar eclipses tides (will download short video clip) |
The Sun-Earth-Moon System
Vocabulary seasons video "Bill Nye" equator hemisphere orbit period of revolution period of rotation rotation axis video elliptical tilt solstice equinox moon phase video waxing phase waning phase video explaining video explaining
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