I was just seeing some charts with Tropical Nakshatra selected in Kala.
What is the exact math operating behind it? Is it mentioned somewhere?
If you use tropical nakshatra, it simply starts the nakshtras at tropical aries.
Yes that is what I thought, but when I tried to manually cross-check it didn't match (but I started with Krittika).
But I just checked now, it takes Ashvini as first?
yes, if you select the simple tropical, it starts at aswinni.