1923. ] The Conception of the Indian Astronomers. 313 
original equinoctial points (i.e. Ist degrees of Aries and Libra) 
and then again proceeds 27 degrees eastward. 
Thus we see that in one Maha-yuga by progressive and 
retrogressive movements (600 x 4) or 2,400 full circuits of 
equinoctial difference take place. Thus dividing 43,20,000 
years by 2,400, we get one full circuit of equinoctial aberration 
taking place in 1,800 years. So that the equinoctial points 
would take 66 years 8 months to travel one degree in this 
way. The formula, which the author of Siryya-Siddhanta 
gives us, being fully worked out, lands us to the same result. 
The formula is this :— 
To find out the libration of equinoxes for a particular day, 
the total number of Aharganas of the day in question, is to be 
multiplied by 600 and divided by Bhi-dina (i.e. total number 
of mean solar days in a Maha-yuga). From the result of this 
division, the < Doh or ‘ Bhuja’ is to be ascertained, and that 
Bhuja is to be multiplied by 3 and divided by 10 and thus 
would be obtained the exact number of degrees, minutes and 
seconds of the precession. 
_ . The number of ‘ Bhi-dina’ or ‘Kvaha’ in a Maha-yuga, 
is fixed and is given by the author as 157, 79, 17, 828. 
Cf. “ aq-gperfs-euig-anifs-fawat ga |” 
Ch. 1, SL. 37. 
also, “wafay tear atq-aaaefaat HET: ” 
Ch. 1, SI. 39. 
Now let us turn to another very old astronomical treatise. 
2. Sdma-Siddhanta :— 
It gives :— 
“git 4 wemameat Hawa Ue Hae | 
aga ufeaat aaa saawaae! | 
aware stent fewararsataat: |” 
; (Spastadhikara Chapter, verses 31 and 32.) 
He 
in Siryya-Siddhanta. The process of finding 
h 
multiply it by 3 and then divide it by 10. is we see 
according to Séma-Siddhanta also the annual libration is 54 
Seconds. [I would now turn to another old astronomical 
treatise. 
