Have you ever wondered how and what units were used in ancient times to calculate days and how accurate they were compared to the modern dating approach?
In Vedic astronomy, there is a concept of 7 islands and oceans which represent the 7 planets and this is altogether called as Bhu-Mandala. Earth is considered the petal of the lotus(universe) and is a part of Jambudwipa surrounded by an ocean of saltwater. One solar year is the period of a complete revolution of the earth around the sun which is 365 days, 5 hours, 48 minutes, and 45.51 seconds.
Puranic scholars believed that one Bhu-Mandala year is equal to one solar year but this concept was challenged by Swami Shridhara. The Vishnu Puran has given various divisions of time such as thirty Muhurtas make a day. Each Muhurta is 48 minutes and 1 Kala is 1.6 minutes long. The earlier texts say that thirty Kalas make one Muhurta but Shridhara Swami says that sixty Kalas make 1 muhurta. This means that Shridhara's computation of units of time is twice that of traditional value. Hence, a factor of two has been introduced in the Indian ancient computation of time and two must be multiplied to the solar year in order to achieve Bhu-Mandal years.
1 Bhu-Mandala Year=2 Solar Years
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There are three scientific dating methods:
1. Radiometric dating- This includes Argon-Potassium, Rubidium-Strontium, and Uranium series
3. Cosmological dating- Microwave Background Radiation and Baryon Acoustic Oscillations are two methods of cosmological dating
The radiometric and cosmological dating differs from Puranic dating by a value of two. Therefore, Shridhara's calculation is to be accepted in order to calculate Bhu-Mandal years from solar years.
Reference-The Big-Bang And The Sages(Book by Sidharth Chhabra,
Madhavendra Puri Das)
It is evident from the above table that Bhu-Mandal year is twice that of a solar year. Our current position in Puranic chronology is a few thousand years in the Kali Yuga of the 28th Chaturyuga of 7th Manvantara.