One day out of this long life of Brahma is called a Kalpa; and a Kalpa is that portion of time which intervenes between one conjunction of all the planets on the horizon of Lanka, at the first point of Aries, and a subsequent similar conjunction.  A Kalpa embraces the reign of fourteen Manus, and their sandhis (intervals); each Manu lying between two sandhis.  Every Manu's rule contains seventy-one Maha Yugas, - each Maha Yuga consists of four Yugas, viz. , Krita, Treta, Dwapara, and Kali; and the length of each of these four Yugas is respectively as the numbers, 4, 3, 2 and 1.

The number of sidereal years embraced in the foregoing different periods are:

Mortal years

360 days of mortals make a year

1

Krita Yuga contains

1,728,000

Treta Yuga contains

1,296,000

Dwapara Yuga contains

864,000

Kali Yuga contains

432,000

The total of the said four Yugas constitute a Maha Yuga

4,320,000

Seventy-one of such Maha Yugas form the period of the reign of one Manu

306,720,000

The reign of 14 Manus embraces the duration of 994 Maha Yugas, which is equal to

4,294,080,000

Add Sandhis, i. e. , intervals between the reign of each Manu, which amount to 6 Maha Yugas, equal to

25,920,000

The total of these reigns and interregnums of 14 Manus, is 1,000 Maha Yugas, which constitute a Kalpa, i. e. , one day of Brahma, equal to

4,320,000,000

As Brahma's night is of equal duration, one day and night of Brahma will contain

8,640,000,000

360 of such days and nights make one year of Brahma, equal to

3,110,400,000,000

100 of such years constitute the whole period of Brahma's age, a Maha Kalpa.

311,040,000,000,000

These figures are not fanciful, but are founded upon astronomical facts.