The archive said one thing; the sky said another. Varāhamihira (505 CE) reports that older texts place the summer solstice at the middle of Āśleṣā, "then the ayana was right" — but in his own day it turns at Punarvasu, roughly 23 degrees earlier. That gap between dated records and current observation is the precession of the equinoxes, caught by comparing archives about 1,700 years apart. Hipparchus found it first (~130 BCE, from Babylonian and Greek records); Varāhamihira's verse shows the Indian tradition detecting the same slow drift in its own.