from Max's post,
It is based on an ancient text known as 'Surya Siddhanta'
(Get ready for some Serious Maths) 😃
Hindu Time calculation is based on Lunar Calender, which came into effect after the Kshya Shraap given to Chandrama by Daksha.
1 Lunar Month = 15 Bright days (Shukla Paksh) + 15 Dark days (Krishna Paksh) = 30 Days
12 Months = 360 Days = 1 Human Year
1 human year = 1 Divine day (1 day of Devas)
30 divine days = 1 Divine Month = 30 human years
12 Divine months = 1 Divine Year = 360 Divine days = 360 Human Years
Devas Lifespan = 100 Divine years = 36,000 human years
The calculation of yugas follows the series of 4 : 3 : 2 : 1
so Satya Yug (4) : Treta Yug (3) : Dwapar Yug (2) : Kali Yug (1)
Kaliyug starts with a Dawn (Purva Sandhya = 1 Divine Lifespan) + 10 Divine Lifespans and ends with a Twilight (Uttar Sandhya = 1 Divine Lifespan)
so, Kaliyug = 100 + 1000 + 100 = 1200 Divine years
= 4,32,000 human years = 1 Charana
Going by the above series,
Dwapar Yug = 2 X Kaliyug = 200 + 2000 + 200 = 2400 Divine Years
= 8,64,000 human years = 2 Charanas
Treta Yug = 3 X Kaliyug = 300 + 3000 + 300 = 3600 Divine Years
= 12,96,000 human years = 3 Charanas
Satya Yug = 4 X Kaliyug = 400 + 4000 + 400 = 4800 Divine Years
= 17,28,000 human years = 4 Charanas
1 Mahayug = Satya Yug + Treta Yug + Dwapar Yug + Kaliyug
= 4800 + 3600 + 2400 + 1200 = 12000 Divine Years
= 43,20,000 human years = 10 Charanas
71 Mahayugas = 1 Manvantara (Each Manvantara is ruled by a Manu)
Each manvantara is followed by a Twilight (called Sandhi Kaal) of 4 Charanas
1 Kalpa consists of 14 Manvantaras (each with its own Manu) followed by a Sandhi Kaal and each kalpa starts with a Dawn (called Adi Sandhi) also equal to 4 Charanas
so, 1 Kalpa = 1 Adi Sandhi + 14 Manvantaras + 14 Sandhi Kaal
= 4 Charanas + (14 X 71 Mahayugas) + (14 X 4 Charanas)
= 994 Mahayugas + 60 Charanas
= 994 Mahayugas + 6 Mahayugas
= 1000 Mahayugas = 4,32,00,00,000 human years
2 Kalpa = 1 Brahma Day = 8,64,00,00,000 human years
30 Brahma Days = 1 Brahma Month
12 Brahma Months = 360 Brahma Days = 1 Brahma Year
= 31,10,40,00,00,000 human years (3.1104 trillion human years) 😕
Brahma Lifespan = 100 Brahma Years
1000 Brahma Lifespans = 24 Minutes in 1 Vishnu Day 😲
360 Vishnu Days = 1 Vishnu Year
Vishnu Lifespan = 100 Vishnu Years
1000 Vishnu Lifespans = 24 Seconds of 1 Shiva Day 😳
360 Shiva Days = 1 Shiva Year
Shiva has no lifespan, i.e. he is beyond life and death, he is eternal 😊
Current Date:
As of today, 50 years of Brahma have elapsed and we are in the First Day of the 51st year. Within this Day, 6 Manvantaras have elapsed and we are in the 7th Manvantara (ruled by Vaivasvatha Manu).
Within this Manavantara, 27 Mahayugas, and the Satya, Treta and Dwapar Yugas of the 28th Mahayuga have elapsed. We are in the Kaliyuga of the 28th Mahayuga.
The time elapsed since the current Brahma:
1 Brahma Year = 3.1104 Trillion Human Years
50 Brahma Years = 3.1104 * 50 = 155.52 Trillion Human Years
In the First Kalpa of 1st day of 51st Brahma Year:
1 Adi sandhi + 6 Manvantaras + 6 Sandhi Kaal
= 17,28,000 + (6 X 71 X 43,20,000) + 6 x 17,28,000 = 1.852416 Billion Human Years
In the 7th Manvantara:
27 Mahayugas = 27 x 43,20,000 = 116.64 Million Human Years
In 28th Mahayug:
Satya Yug + Treta Yug + Dwapar Yug = 17,28,000 + 12,96,000 + 8,64,000 = 3.888 Million Human Years
The current Kaliyug began at Midnight of 17 Feb - 18 Feb, 3102 BC
So, In current Kaliyug:
3102 + 2013 = 5115 human years
So the total time elapsed since current Brahma is
155.52 Trillion + 1.852416 Billion + 116.64 Million + 3.888 Million + 5114
= 15,55,21,97,29,49,114 Years have passed since the dawn of time
Phew!!!! that was a Looong calculation 🤪
Thanks for reading
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