If there should be a fall of rain when the Moon passes through the asterisms of Viśākhā and Uttarāṣāḍha in the lunar month of Jyeṣṭha , the quantity of subsequent rainfall will be 20 droṇas ; if when through Āśleṣā , the quantity will be 13 droṇas ; if when through Uttarabhādrapada , Uttaraphālguni and Rohiṇī , the quantity will be 25 droṇas .