Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t45.4

v2.c12.s2.t45.4

It shows that this work was compiled on the basis of the Sūrya Siddhānta and that the author was a resident of Vārāṇasi. The ending moments of tithis etc., given in ghaṭis and pala’s, when calculated according to this work, are found true chiefly for Vārāṇasi. The Sūrya Siddhānta referred to in this, proves to be the modern Sūrya-Siddhānta from the theory. It is stated in the version printed at Vārāṇasi that the work had adopted Śaka 1400 as the epochal year. There is no other internal evidence in support of this assertion, nor does the author find any external evidence. There is, however, no reason to doubt its authenticity. Diwakar wrote a commentary on this work named Makarandavivaraṇa about Śaka 1540. The ending moments of tithis etc., and places of all planets are obtained very easily with the help of this work. The author does not describe the system for want of space. In many parts of Northern India, like Gwalior and Vārāṇasi, almanacs are compiled with the help of this work even at present, and these are used by the local population. This work is printed in Vārāṇasi. The theory underlying these tables has been explained by Gokulnāth Daivajñya in Śaka 1688, and it has also been printed.