The Hindus use a sexigesimal number system. With that system, we find many of the same sacred numbers that we find in other systems around the globe. For example, a day is subdivided into a period as small as 1/216 000.

There is an epoch of time called caturyuga consisting of 4 320 000 solar or sidereal years (conflicting sources).

A 10th of a caturyuga multiplied successively by 4, 3, 2 and 1 each define respectively the length of time of the krtayuga which is 1 728 000 years, the tretayuga of 1 296 000 years, the dvaparayuga of 864 000 years and the kaliyuga of 432 000 years. Presently, we live in the kaliyuga which began Friday 18 February 3102 BCE.

A divine year is 360 solar years. The caturyuga is 12 000 divine years (12 000 x 360 = 4 320 000). The total krtayuga lasts 4000 divine years, making 1 440 000 solar years. The tretayuga lasts 3000 divine years, making 1 080 000 solar years. The dvaparayuga lasts 2000 divine years, making 720 000 solar years. The kaliyuga lasts 1000 divine years, making 432 000 solar years.

The period known as a kalpa is 4 320 000 000 sidereal years.

Once again, we encounter an astronomical system based on 144, 72, 36, 108, 216, 432, 864 and so on. Coincidence that the dvaparayuga lasts the same number of solar years as the sun's diameter is in miles (864 000)? Coincidence that the Hindu writings called the Upanishads number 108 books?