Calculation Of Time in Indian Tradition

• 1 human fortnight (15 days) = 1 day (light) or night of the Pitṛs
• 1 human month (30 days) = 1 day (light) and night of the Pitṛs
• 30 days of the Pitṛs = 1 month of the Pitṛs = (30 × 30 = 900 human days)
• 12 months of the Pitṛs = 1 year of the Pitṛs = (12 months of Pitṛs × 900 human days = 10800 human days)
  The lifespan of the Pitṛs is 100 years of the Pitṛs (= 36,000 Pitṛ days = 1,080,000 human days = 3000 human years)
• 12000 Deva Years = Life Span of Devas = 1 Mahā-Yuga.
• 1000 Mahā-Yugas = 1 Kalpa = 1 day (day only) of Brahma
  (2 Kalpas constitute a day and night of Brahma, 8.64 billion human years)
• 30 days of Brahma = 1 month of Brahma (259.2 billion human years)
• 12 months of Brahma = 1 year of Brahma (3.1104 trillion human years)
• 50 years of Brahma = 1 Parārdha
• 2 parardhas = 100 years of Brahma = 1 Para = 1 Mahā-Kalpa (the lifespan of Brahma)(311.04 trillion human years)

Note:- Lord Brahma is Devta (Demigod) who is in charge of Creation of Universe.

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