1,292. Calculating Seasons According to This Opinion

Rabbi Jack Abramowitz

Hilchos Kiddush HaChodesh 10:3

Using the calculation of this chapter, the first vernal equinox of creation occurred nine hours and 642 chalakim before the molad of Nisan (9, 642). Therefore, in first year of every 19-year cycle, the vernal equinox occurs nine hours and 642 chalakim before the molad of Nisan.

Hilchos Kiddush HaChodesh 10:4

If you know which year is the first in a cycle, all you have to do to calculate seasons is add 91 days, 7 hours, 519 chalakim and 31 rega per season until you reach the end of the cycle.