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Why We Have Seasons
Earth's axis is tilted.
When our half tilts toward the Sun, we get summer: long days and direct sunlight.
When it tilts away, we get winter: short days and slanted sunlight.
Moon Phases
The Moon orbits Earth about once a month.
Half of the Moon is always lit by the Sun.
As it orbits, we see different amounts of the lit half: these are phases.
Eclipses
An eclipse happens when the Sun, Earth and Moon line up.
Solar eclipse: the Moon passes in front of the Sun and blocks its light.
Lunar eclipse: Earth's shadow falls on the Moon, which can turn reddish.
Never look straight at the Sun, even during an eclipse!
