On a planet whose Moon is in the same orbital plane as the planet's orbit around its star, how often will solar eclipses occur?

a) Twice every orbit of its moon (twice a month).
b) Once every orbit of the planet around its Sun (its year).
c) Twice every rotation of the planet (twice a day).
d) Once every orbit of its moon (its month).
e) Once every rotation of the planet (its day).


Ans: d) Once every orbit of its moon (its month).

Physics & Space Science

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