Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s3.22

v2.c12.s3.22

In this it is stated that the number of minutes of arcs in the moon's orbit multiplied by 10 gives the length in yojanas. In other words, here 1' arc is taken to be equal to 10 yojanas, while other siddhāntas have taken it to be equal to 15. This appears to be contradictory to other siddhāntas at first sight, but in fact, there is no contradiction. The following table will show that just as the length of the moon's orbit given in other siddhāntas is 3/2 times that given by Āryabhaṭa I, so also are other measures :--