Kāla - Time
Time creates the sky and the earth. Time creates that past and the future. By Time the sun burns, through Time all beings exist, in Time the eyes see. Time is the lord of all. - Atharva Véda
Events in Prakriti or nature, follow a cyclic pattern - day and night, seasons, circle of life from birth to death, seeds from dying trees give birth to new ones etc. The concept of eternal and cyclical time lies at the heart of the Dharmic world view and is closely related to the concept of Ātman. The Rishis considered the real Self to be ever-existing, not only in the future but also from the past. This notion of two-way eternity, however, is not reserved solely for the realm of spirit Bráhman but extends to this temporal world. Within Sanatana Dhamra, we find no "year dot," nor a final cataclysm. Destruction of the cosmos only portends its re-creation. The entire material world is thus subject to everlasting cycles of creation, sustenance and destruction.
The Vedic calendar in particular recognizes time cycles from the smaller scales (Truti - 1/33,750th of a second) to much larger (Mahayuga - 4.32 million years) ones. A cosmic big-bang therefore would only indicate the start of yet another cycle of creation and destruction of matter and not the beginning of an "absolute time".
Time is personified as Yama, the god of death, because death is a limiting factor of life.
Makar Sankrānti
The word Sankrānti in Samskrta denotes the migration of the Sun from one Rāshi (sign of the zodiac) to another. This is generally considered a significant astronomical event and happens once every solar month (12 Sankrāntis a year). Astronomy and astrology in ancient India was brought into the daily life through celebratory festivals.
The tilt of the earth's axis by 23.45 degrees causes the seasons. This is also the reason behind the six months of apparent northern movement of the sun (Uttarāyana) followed by six months of southern movement (Dakshināyana) across latitudes.


