1.-Earth was formed about 4.54 billion years ago.
2.- Earth gravitationally interactswith other objects in space, especially the Sun and the Moon.
3.-During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar days or one sideral year.
4.-Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbit plane,seasonal variations on the planet's surface with a period of one tropical year (365.24 solar days).
5.-The Moon is Earth's only permanent natural satellite. Its gravitational interaction with Earth causes ocean tides, stabilizes the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate.
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