The sun gives energy, in the form of heat and light.
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An astronomical unit (AU) is the average distance of the earth from the sun.
The Moon is much closer to Earth than the Sun is, therefore making the moon appear to be as large or larger than the sun when viewed from Earth.
The sun gives the Earth warmth and energy, without which it would be impossible for life to exist. Also, without the sun, it is unlikely that Earth would have ever formed, because it formed out of a disc of debris that circled the sun.
The sun rises because of the position of the earth in relation to the sun. One complete revolution of the earth happens every 24 hours. While the earth is turning it seems that the sun is in a different spot in the sky, but the sun is stable and the earth is spinning.
The Earth's spin, or rotation on its axis gives us a day.