A solar eclipse occurs only during a new Moon is due to the reason mentioned below.
A solar eclipse occurs when the moon gets between Earth(opens in new tab) and the sun, and the moon casts a shadow over Earth.
A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.
But whether the alignment produces a total solar eclipse, a partial solar eclipse or an annular solar eclipse depends on several factors, all explained below.
Eclipse can only happen when the Moon is exactly in line, between the Sun and Earth.
That in turn means that the day side of the Moon is completely on the far side of the Moon since all three bodies are in line.
Day side of the Moon, completely on the far side of the Moon, is exactly what we call “the new moon” on Earth;
i.e. Earth can only see the night side (dark side) of the Moon. Therefore Solar eclipse can only happen on a New Moon day.
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