Physics gravity

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why there are seasons on earth

Because Earth is almost spherical, the Sun’s rays don´t hit all parts of the planet at the same angle. This angle varies depending on the Earth’s position with relation to the Sun.

EARTHS ROTATION: The Earth takes 23 hours and 56 minutes to complete one rotation on its axis.

Rotation causes day  (number of hours of daylight) and night (number of hours of darkness).

MOONS FORMATION:The most accepted theory about the Moon’s formation states that this satellite was formed when a giant planet, named Theia, hit the Earth 4.5 billion years ago. Then, a piece of the Earth broke off and remained in orbit around the Earth, held by the force of gravity.

ECLIPSES:An eclipse occurs when one body comes between two others, so that one is hidden from the other.

Due to the relative position of the Earth, the Moon and the Sun, when all three are aligned an eclipse will occur.

Depending on the amount of the Sun or Moon that is hidden from sight, an eclipse can be total or partial.

On average, there are a minimum of four eclipses a year: two solar eclipses and two lunar eclipses.


In the solar eclipse, the Moon comes between the Earth and the Sun. Although the Moon is much smaller that the Sun, it appears to be the same size as the Sun due to the distance between both of them and the Earth.

LUNAR ECLIPSE:In the lunar eclipse, the Earth comes between the Moon and the Sun. A full shadow is called the UMBRA and a partial shadow is called the PENUMBRA.

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