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

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सिद्धान्त दर्पण
Stars | Longitude in Saka 1816 | Reduced longitude | Difference
Krittika (23 Tauri) | 58°-14′ | 38°-52′ | 19°-22′
Rohini | 68°-17′ | 47°-56′ | 20°-23′
Pushya (δCancri) | 127°-21′ | 106°-0′ | 21°-21′
Magha | 148°-21′ | 129°-0′ | 19°-21′
Chitra¹ | 202°-22′ | 181°-23′ | 21°-9′
Visakha² | | |
Anuradha | 241°-45′ | 224°-31′ | 17°-14′
Jyeshtha | 248°-17′ | 230°-41′ | 17°-36′
Purvashadha | 273°-6′ | 254°-30′ | 18°-36′
Uttarashadha | 278°-43′ | 260°-18′ | 18°-25′
Satatara | 340°-05′ | 319°-41′ | 20°-24′
Revati | 373°-34′ | 359°-50′ | 18°-34′
The mean of the differences is 19°-18′ carrying
us back to about 433 Saka. If it were possible to hit
upon the stars that were taken as fundamental stars
for the measurement of the Dhruvas, we could have
arrived at the correct result. We might fairly take
the star Magha as one of them, since it is a star of
the first magnitude, situated on the ecliptic, and
otherwise important in Sanskrit astronomy. It
would be seen from the precession of the star that
the Saka year 430 is reached.
As has been already pointed out, an allowance
must be made in the amount of precession deduced
from the recorded Dhruvas of stars. Still, the mean
general precession furnishes approximately the date
of their measurement. Dr. Thibaut has employed
the method to determine the "beginning of the
scientific period of Hindu astronomy". From Prof.
Whitney's discussion of the star-longitudes given in

1. Bhaskar's Dhruva of the star is assumed.
2. I am not certain of Visakha. If it be identified with α Libra
   the difference amounts to 22°-46′.