सिद्धान्तदर्पण (महामहोपाध्याय सामन्त चन्द्रशेखर सिंह - नग्न-नेत्र खगोल वेध एवं गणित महाकोश)

lx सिद्धान्त दर्पण
Kratu Ursa majoris
Pulaha Ditto
Pulastya Ditto
Atri Ditto
Angira Ditto
Vasishtha Ditto
Marichi Ditto
Apayavasu 5°N. of Spica; 5th mag.
Apamvatsa 6°N. of Apaya; 5th mag.
The polar longitude and latitude of
Chandraskhara's Revati , as given in the work, are
slightly incorrect. In a letter to me, he gave 359°10′
and 5°30′N. as the corrected longitude and latitude.
Accordingly, the precession of the star amounted
to 22°20′-41″ in Saka 1816. These correction were
thought necessary by him in order that the observed
ayanamsa might agree with the precession of the
star as he ascertained it. But we cannot but admit
that he has confounded ayanamsa (or
sun-precession) with star-precession.¹ For, it is
obvious the amount of ayanamsa we observe by the
Sun affects only the Sun's place in finding moment
of his crossing the equinoctial points, while the
general precession of the stars remains unaffected
by the slight increase assumed in the length of the
year. But credit must be given him for his
conssitency in the view, however wrong it may be
in the light of the facts disclosed.
Another important improvement made by

1. An instance of an error of this kind is currnt in our Bengali
   almanacs in which the equinoxes are puttwo days later
   on account of the ayanamsa being taken at 20°55′.