Yes, the spelling is correct, even if we write it in just one word.
Do you know that the correct traslation is not "crescent moon", but "half moon"?

You reminded me a saying
luna crescente, gobba a ponente
luna calante, gobba a levante

crescent moon, hump ( looking) west
decrescent moon, hump (looking)east.

But it works just in the northern emisphere!