1) Only the solar month is taken into account.
So it must be in simha (AvaNi) mAsam, which
is mid-August to mid-September.
2) The target date in this month is kRshna-ashTamI
(8th day of the waning phase of the moon) in conjunction
with rOhiNI. However, on that day, not even a tiny bit
of saptamI should exist post-sunrise, nor should there
be any kRttikA nakshatram.
3) If there is no pure ashTamI-rOhiNI conjunction as
described in (2), navamI-rOhiNi is the next preferred
conjunction, with once again a pure rOhiNi mandatory.
4) If (3) is not possible, mRgaSIrsha nakshatra combined
with navamI or daSamI is the next preferred choice.
5) If this observance of SrI jayantI does not fall on
ashTamI, the ashTamI is treated as any other day and
requires no special observance
