The earth rotates once on its axis in 24 hours - a day.
The side of the earth that faces the sun has daylight. The
side that faces away has night.
The earth is slightly tilted on its axis.
It takes the earth 365¼ days to orbit the sun - a year.
Every 4 years we have 366 days, so February gets 29 days
instead of 28.
The earth stays in its orbit round the sun because the sun
has a gravitational pull on the earth.
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