If the sun is said to rise at morning, should I say 'the moon rises at night'?
Or is there another expression?
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The sun rises in the morning simply because morning happens when the sun rises.
From NOAD [emphasis added]:
NOAD doesn't mention anything about sunsets under its definition of evening, but there's an interesting and pertinent note under the word origin:
My opinion? Yes, you could say the moon rises at night. Such a statement would not be strictly astronomically correct, but would lean on the reality that the most striking moonrises happen at night with a full moon.
Then there's this interesting literary tidbit:
So, the moon rises at night in the sense of how moonlight "governs" the night.
Perhaps the fact that less noticeable moonrises happen at midday bothers you, and you'd prefer to be less poetic and more astronomically correct. In that case, you could say the full moon rises at night, or the sun rises in the morning, and the moonrise lights up the nighttime sky, which would be true when the moon happens to rise after sunset.
These are not related to the diurnal cycle in a fixed way. The time depends on the phase of the moon.