Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s10.8

v2.c12.s10.8

The polar latitudes and polar (sāyana) longitudes for 1887 A.D. of the junction-stars as adopted by the author, have been calculated from their right ascensions and declinations given in the French Connaissance-des-Tempes. The longitude of Spica thus obtained is 201° 26' 16".3. Assuming the longitude of Spica to be 180°, the author has mentioned in the column headed "his opinion" the longitudes of all stars after subtracting from their (Sāyana) longitudes the ayanāṃśa figure 21°-26'-16".3. These are true for Śaka 1809. The latitudes also are true for the same year. But because the longitudes are nirayaṇa, only a very slight variation will occur in them with the lapse of time. If Mu Piscivm be assumed to be the star at the initial point, the longitudes of stars according to "his opinion" will have to be reduced by 1° 20'.