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affect its shape and is related to seasons and tides. Astronomy Rotation The Earth rotates in a full circle each day. When North America is facing the sun it is daytime. When North America has its back to the sun it is nighttime. With out this rotation, we would not have a daytime or a nighttime phase. While the Earth is rotating, it is also revolving around the sun. Revolution As stated before, the earth revolves around the sun while it is rotating on its axis. This revolution causes an annual season cycle and the formation of years to occur. The farther a planet is away from the sun, the longer it takes to make one revolution. It takes 365 days for planet Earth to make a complete revolution around the sun. This is why there are 365 days in each year. Tides Seasons The inclination of earth’s axis to the plane of the ecliptic creates the yearly cycle of seasons. In other words, this occurs when the Northern Hemisphere is in front of the sun during the revolution process. We are receiving direct sunlight which causes summer. When the Northwestern hemisphere is behind the sun, we receive indirect sunlight. This creates winter. The Sun's Shape Tides are created because the Earth and the moon are attracted to each other. As the moon pulls on the Earth, everything is able to stay in place, except water. Because this water is not stabilized, the pulling of the earth creates two high tides and two low tides. Tides are periodic because of the Earth‘s rotation. The rotation around the Sun is also important because the moon revolves around the Earth, which revolves around the Sun. If we were not revolving, the tidal periods would be occurring at different times. As the Earth rotates and revolves, the size of the Earth increases at the circumference. This is also true for the sun, except the circumference is decreasing.