Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s5.9.4

v2.c12.s5.9.4

and once this practice secured a firm footing, the future authors of ‘human’ works abstained from mentioning the preliminaries leading up to the final results. These were quite probably the reasons why our ancient works lack the information about the observations taken, similar to what we find recorded in Ptolemy’s works about his own observations and those taken by Hipparchus, or in the works of later western astronomers. However, some information about the individual efforts made in respect of observations has already been given and some more will be given further on.