Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t9.2

v2.c12.s2.t9.2

The Pañcasiddhāntikā included all the siddhāntas excepting the Somasiddhānta, and it has already been shown that these siddhāntas and those which are to be considered now, are different, and this fact will be further corroborated by the discussion which will follow. The siddhāntas whose study is going to be made now are extant present and are different from those belonging to the Pañcasiddhāntikā group; and that is why the epithet ‘modern’ has been applied to them. Although there is no definite evidence to show that there existed or still exist two Somasiddhāntas, still it is completely similar to the other four, and it is desirable to study it (i.e. Somasiddhānta) along with them. After a general discussion of the five siddhāntas, each of them will be considered separately later on.