Warning: I teach the exact opposite of this... and my muscle test shows that Rosh Hashanah is the conception, and Pesah is the birth... Rosh Hashanah (Hebrew: ??? ?????), (literally "head of the year"), is the Jewish New Year.
Rosh Hashanah marks the start of a new year in the Hebrew calendar
Rosh Hashanah occurs 163 days after the first day of Passover (Pesach)
The 163 days could be called the gestation period of the new year. Because it is at Passover that the New Year is really born, as in conceived.
That is why Aries is the first month of the Zodiac and not Virgo.
Closer to what I teach is here