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Astronomy: Articles
Eclipses
An explanation of what eclipses are, with images and animations.
Phases of the moon and planets
An explanation of why we see the moon (and some planets) change phases, with images and animations.
Retrograde Motion of planets
An explanation of the retrograde motion of some planets: why they seem to go back on their tracks, as viewed from Earth. With images and animations.
Seasons
An explanation of what seasons are, and why they occur. With animations and images.

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