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