“The Neroses, the Vrihaspati, or the periods called yugas or kalpas, are life problems to solve. The Satya-yug and Buddhistic cycles of chronology would make a mathematician stand aghast at the array of ciphers. The Maha-kalpa embraces an untold number of periods far back in the antediluvian ages. Their system comprises a kalpa or grand period of 4,320,000,000 years, which they divide into four lesser yugas, running as follows:
1st. – Satya yug – 1,728,000 years.
2nd. – Tretya yug – 1,296,000 years.
3rd. – Dvapa yug – 864,000 years.
4th. – Kali yug – 432,000 years.
Total – 4,320,000 years.
which make one divine age or Maha-yug; seventy-one Maha-yugs make 306,720,000 years, to which is added a sandhi (or the time when day and night border on each other, morning and evening twilight), equal to a Satya-yug, 1,728,000, make a manwantara of 308,448,000 years;
fourteen manwantaras make 4,318,272,000 years; to which must be added a sandhi to begin the kalpa, 1,728,000 years, making the kalpa or grand period of 4,320,000,000 of years.
As we are now only in the Kali-yug of the twenty-eighth age of the seventh manwantara of 308,448,000 years, we have yet sufficient time before us to wait before we reach even half of the time allotted to the world.”
H. P. Blavatsky