When the Sun, the Earth and Moon are in a straight line
When the Sun and Moon make a right angle
When a strong wind blows
When the night is very cold
Earthquake
Sun
Stars
Moon
Due to the effect of the Sun
Due to rotation of the Earth
Due to the combined effect of Sun and the Moon
Due to Gravitation, Centripetal force and the Centrifugal force
Gravitational force of the Moon
Gravitational force of the Sun
Centrifugal force of the Earth
Gravitational force of the Earth
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