What sets the "Snake" (Pambu) almanac apart from others is its adherence to the Surya Siddhanta, an ancient mathematical tradition of Indian astronomy.
Each month includes:
Pambu Panchangam is a type of Panchangam that originated from the southern Indian state of Tamil Nadu. The term "Pambu" refers to the name of a village in Tamil Nadu where this Panchangam was first created. This Panchangam is based on the traditional Hindu calendar and is widely used in southern India, particularly in Tamil Nadu and Kerala. Pambu Panchangam 1998 Pdf