Astronomical basis of the Hindu calendar
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The Hindu calendar is based on a geocentric model of the Solar System. A geocentric model describes the Solar System as seen by an observer on the surface of the Earth.
The Hindu calendar defines nine measures of time (Sanskrit: मान IAST:māna):
- brāhma māna
- divya māna
- pitraya māna
- prājāpatya māna
- guror māna
- saura māna
- sāvana māna
- candra māna
- nākṣatra māna
Of these, only the last four are in active use and are explained here.