The Extraction of Determinations for Lunar Days

13 ...the latter time is preferred. In cases of special pervasiveness or excessive pervasiveness where both days are pervaded by the lunar day, the "pierced" or overlapping day should be accepted. If the fourteenth lunar day measures only eighteen Ghatikas Ghatika: a traditional unit of time equal to 24 minutes; eighteen ghatikas equal 7.2 hours, then for the Savitri Vow original: "sāvitrī vrate"; a fast and prayer observed by married women for the longevity of their husbands, based on the legend of Savitri and Satyavan, the latter day is chosen, according to Madhava referring to Madhavacharya, a prominent 14th-century authority on ritual law. However, Kamalakara referring to Kamalakara Bhatta, the 17th-century author of the 'Nirnaya Sindhu' does not agree with that opinion and states that the former day should be taken.

Thus ends the month of Jyeshtha. Now begins the month of Ashadha.

In the bright fortnight of Ashadha Ashadha typically falls in June–July, the commencement of the Chaturmasya Vow Chaturmasya: a four-month period of spiritual austerity, typically observed by monks and householders during the monsoon season should be performed on the eleventh or the twelfth lunar day. On the eleventh day of the bright fortnight, when it is in conjunction with the Anuradha a specific lunar mansion or constellation... 13

...the Parana Parana: the formal breaking of a ritual fast should be performed during the first part of the day that is free from that specific astronomical conjunction. On this very same day, the Festival of Vishnu likely referring to Shayani Ekadashi, when Vishnu is said to begin his four-month cosmic sleep should be celebrated.

Regarding the Kokila Vow original: "kokilā vrate"; a vow dedicated to the goddess Sati, who took the form of a cuckoo (kokila) on the full moon of Ashadha: if the seventh-day worship pervades the evening and lasts for three Muhurtas Muhurta: a unit of time lasting 48 minutes, it should be performed on the latter day.

Thus ends the month of Ashadha.

Now begins the month of Shravana.

Starting from the third day of the bright fortnight of Shravana Shravana typically falls in July–August and continuing for an entire month, the Worship of Gauri Goddess Parvati is to be performed by maidens. If the time for this lasts for three Muhurtas, then according to the Rama Kautuka a specialized treatise on astrology and rituals, the latter day is preferred. On the fourth day of the bright fortnight of Shravana, a ritual involving a thread or ornament with twenty knots original: "viṃśatigranthiyutaḥ"; likely referring to the preparation of a sacred protective thread is to be prepared for both married women and maidens...