As the name suggests, this day is observed when the asterism of Pooram is in the ascendant in the Tamil month of Aadi. The asterism of Pooram is contained in the zodiacal sign of Leo (simmaraasi); this means that the moon is in simmaraasi on this day; the sun, on the other hand, is in the zodiacal sign of Cancer (kadaharaasi) on this day. The planetary lord for simmaraasi is the sun and for kadaharaaasi, the moon. The day of Aadippooram is significant on this basis, where the sun is in the ruling house of moon and vice versa.
Aadippooram is said to be the birth star of the female Vaishnavaite saint [aal(z)vaar], AaNdaaL. One other Vaishnavaite saint Periyaal(z)vaar found AandaaL as a baby by the side of thulasi maadam (a raised altar with the basil plant) on a Saturday when the asterism of Pooram and the fourteenth phase (sadhurtthasi) of the waxing moon were prevalent in the month of Aadi of the Hindu year, NaLa.
It is said that Goddess Umaadhevi came of age on
the day of Aadippooram. This is a simple way of reflecting the astrological
observation; we have seen earlier, the force of Sakthi is overwhelmingly
prevalent in the month of Aadi.
