Using the following information from The Skylive, and simple arithmetic I tried to calculate longitude of Alcyone in the year 41050 BCE at a place: 29.9457 N , 78.1642 E.
Galactic Longitude 166.67°, Galactic Latitude -23.45°
I could calculate it to be 330° against the expected value of 360°. I used J(2000) value of 25771 years for the precessional cycle of earth's axis.
Where did I miss?
Any help would be appreciated.