Vaishnava Dharmashastra 90.11

90.11

jyaiṣṭhī jyeṣṭhāyutā cet syāt, tasyāṃ chatropānahapradānena gavādhipatyaṃ prāpnoti ||

If on the full moon day of the month Gyaishtha the moon enters the lunar asterism Gyeshtha and he gives on that day an umbrella and a pair of shoes (to a Brâhmana), he becomes possessed of many cows.