AMBUBACHI,DAKSHIN AYAN and Sankranti

Karka Sankranti : July 16, marks the transition of the Sun into Karka rashi (Cancer). This also marks the end of the six-month Uttarayana period of Hindu calendar, and the beginning of Dakshinayana, which itself end at Makar Sankranti.[1] Mithuna Sankranti: celebrated as annual menstruating phase of Mother Earth as Raja Parba or Ambubachi Mela in Eastern and North Eastern provinces of India. in the sidereal solar Bengali calendar and Assamese calendar, a Sankranti is marked as the end of each month and the day following as the beginning of a new month. source : https://en.m.wikipedia.org/wiki/Sankranti https://books.google.co.in/books?id=5kl0DYIjUPgC&pg=PA351&redir_esc=y