- The Earth’s spinning on its axis reasons day and night. EARTH MOVEMENT
- The Earth’s revolution (in its orbit around the Sun) causes a change in seasons.
- When nights and days are equal is recognized as ‘Equinoxes.’ During the equinox’s time, the Sun shines accurately over the equator.
- 21 March (of each year) is recognized because the vernal (spring) equinox and 23 September (of each year) is recognized as the autumnal equinox. EARTH MOVEMENT
- When the distinction between the length of day and night is most recognized as ‘Solstice.’
- During the solstice time, the Sun shines over the tropics (either on the Tropic of Cancer or Tropic Capricorn).
- 23.50 North represents ‘Tropic of Cancer.’ On June 21, the Sun shines over the Tropic of Cancer and it is known as the longest day of the year.
- 21 June is recognized as the Summer Solstice.
- 23.50 South represents ‘Tropic of Capricorn.’ On December 21, the Sun shines over the Tropic of Capricorn and it is known as the longest night of the year.
- 21 December is recognized as Winter Solstice.
- When the light of a celestial body is obscured by another celestial body, the situation is known as ‘Eclipse.’
- When the Earth arises between the Sun and the Moon, it is recognized as a “Lunar Eclipse.”
- When the Moon comes between the Sun and the Earth, it is known as a “Solar Eclipse.”
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