Tithi Pravesha Chart Calculation

[Guest guest]

Dear Chitra,

 

> Dear Sanjay and Narasimha,

> Could you please teach us how to calculate the Tithi Pravesha time.

How

> did you arrive at the time? What are the manual calculations.

>

> Thanks and regards

> Chitra

 

I use my software "Jagannatha Hora" for the calculations.

 

If you want to do it, here is how:

 

(1) In the natal chart, find the sign occupied by Sun, tithi running

and the fraction of tithi left.

 

Let us take an example of my 1987-88 annual TP chart. Birthdata is

4th April 1970, 5:47:20 pm (IST), 81e08, 16n10.

 

Sun is in Pisces. Krishna Chaturdasi tithi was running and 85.979769%

of the tithi was left at birth.

 

(2) Find when Sun returns to his natal sign during the year of

interest.

 

In 1987, Sun returns to Pisces and stays in it during (roughly) March

15-April 15, 1987.

 

(3) In the period found in (2), find when the tithi found in (1)

returns.

 

For example, take March 15-April 15, 1987. Krishna Chaturdasi tithi

came back in this month on March 27-28, 1987.

 

(4) Find the starting and ending time of the tithi.

 

On March 27-28, 1987, for example, Krishna Chaturdasi tithi started

at 21:25 on March 27, 1987 and ended at 19:39 on March 28, 1987.

 

(5) Find when the same fraction of tithi was left as found in (1).

 

The length of the tithi was 24 hrs + 19:39 - 21:25 = 22 hours 14 min,

i.e. 1334 min. Of this, 85.979769% is 1147 minutes, i.e. 19 hours 7

min.

 

So take 19 hours 7 min before the end of tithi. Then exactly

85.979769% of the tithi is left.

 

Taking 19:39-19:07 is 0:32. So, at 12:32 am in the early hours of

March 28, 1987, exactly the 85.979769% of Krishna Chaturdasi was left.

 

(6) Now take this date and time and the longitude and latitude of the

birthplace and cast the chart.

 

May Jupiter's light shine on us,

Narasimha