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Sri SreeKrishna Tatachar wrote: ".................
Two thousand Mahayugas make a Kalpa (or day and night of Brahma, which is
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........1 Kalpa= 14 x 71 x 4320000 + 15*x (2/5) x 4320000 yrs=1000 Mahayugas
*In between two successive Manus, there is a Sandhya period. ............."
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Dear Bhagavatas,

I would like to get some doubts clarified and add some comments to Sri ST's
post. My intent is to better understand and appreciate the subject & logic.
This is a lengthy post that may not interest everybody. I apologize.

In the post:
1. Initially it is shown 1 Mahayuga = 4,320,000
2. Then, two thousand Mahayugas is shown to equal a Kalpa = 8,640,000,000.
3. Then it was pointed out a Manvantara is also known as MahaYuga, and we
are in the Seventh (Vaivasvata) Manvantara.
4. And then, 1 Kalpa is shown equal to 1000 MahaYugas? -Contradiction with #
2 above. It should be 1/2 Kalpa, if #2 is taken to be correct.
5. Finally, it is shown in the present Kalpa we are past 6 Manus, 27
MahaYugas?, 3 Yugas and 5102 Years into Kali Yuga. This contradicts with #3
that mentions we are in the Seventh Manvantara or MahaYuga!!

My argument is, either:

a) We are past 6 Manus and 27 Manvantaras
OR
b) We are past 6 Manvantaras, 3 Yugas and 5102 Years into Kalki.

Not both - fully or partially.

Since we are said to be in the Seventh Manvantara [Vaivasvata] of this
Kalpa, I assume the latter (b) is correct.

Now with this information, if we rework the numbers:

If 2000 MahaYugas make-up a Kalpa, 1 Kalpa = 8,640,000,000 Years. [A]

(Assuming everything else like 1 Manu = 71 MahaYugas and 1 MahaYuga =
4,320,000 and 1 Sandhya = 2/5th of a MahaYuga is correct).

1 Kalpa = X Manus + Y Sandhyas (ignoring Y to compute approx. X)
8,640,000,000 = [X * 71 * 4,320,000] => X = 28 Manus.
1 Kalpa = 28 Manus + 30 Sandhyas.

Earlier it was mentioned that:
1 Mahayuga = 1 Manvantara = 4,320,000 years. [Satya +Treta+ Dwapara+ Kalki]

If we accept 1 Kalpa = 2000 Mahayugas or Manvantaras, and we are in the
Seventh Manvantara, it means in this Kalpa, 6 Manvantaras are completed
fully, and 1993 full Manvantaras remain + some portion of this 7th
Manvantara.

6 Manvantaras or MahaYugas Time = 6 * 4,320,000 = 25,920,000 years
completed. [B]

Elapsed Time in 7th Manvantara =
3 Yugas[S+T+D]+ 5102 Kalki Years=[1,728,000 + 1,296,000 + 864,000] + 5,102 =
3,893,102 [C]

Total time elapsed in this (SvetavarAha) Kalpa =
6 Manvantaras + Elapsed Time in 7th Manvantara = [B] + [C] =
25,920,000 + 3,893,102 = 29,813,102 Years [D]

Thus, years remaining in this Kalpa
= Total Kalpa Years - Elapsed Kalpa Years = [A] - [D]
= 8,640,000,000 - 29,813,102 = 8,609,760,000! [E]

Verification:

29,813,102 divided by 4,320,000 ~= 6.9011 (Manvantaras elapsed). Remaining
0.0989 tallies with 426,898 years remaining in Kalki (432,000 - 5102),
confirming we are in the latter part of Seventh Manvantara.

Please feel free to correct any errors or misunderstanding.

Reverently,
Sriram