Light and dark 
Why is it dark at night? Why can't you see stars in the day?

Earth and Moon 
See how our planet spins and why we have seasons

Moon Rotation Relationships

Earth | Animations
An excellent set of 8 animations showing Earth's atmosphere, sea surface temperatures, ocean basins, earthquakes, volo, seasonal changes, water vapour images and Earth's night side.

Earth | Moon | Sun | Animation
An explanation of the concepts of rotation, orbits, axis, day, night and seasons.

Looking from the Sun Animation
If you could travel to the Sun and look back the Earth this is what you would see.