Hashem showed Moshe the new moon:
The Sages state that Moshe Rabbeinu had difficulty understanding at what stage the new moon is to be sanctified. Hashem therefore showed Moshe through prophecy an image of the new moon and stated “This is what is to be seen and sanctified.”
 Rosh Hashanah 20a; Rashi Shemos 12/1-2; Rambam Hilchos Kiddush Hachodesh 1/1
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