The traditional spring festival fell in Medam (April), marking the sun's transit into the first zodiac sign.

Using the star calculations, the 1985 calendar pinpointed:

If you're interested in a digital version, I can also suggest some Malayalam calendar apps or websites that might have archives or simulated calendars for 1985.

The Mathrubhumi Rashi Finder allows you to input any 1985 date to retrieve the specific star, rashi, and tithi for that moment.