JM and other panchanga, why nakshatra time differs

[JyotishMaster]

there is much time difference in calculation of Nakshatra time and others when compared to the most reputed from several decades, accurate, hard copy of ontikoppal panchanga of mysore.

For example:

As Per Jyotish Master:
2 Tue -Sep-2014:
Anuradha: 00:00-18:07
Jyeshta: 18:07-24:00

As Per Ontikoppal Panchanga:
(I have exactly written as it is in Panchanga copy)

2 Tue -Sep-2014:
Ashtami 41-0 (Night 10-39)
Anuradha 19-50 (Day 2-11)
Vidru 12-24
Bhadre 12-43 Visha 33-30 Amrutha 56-57
a.pra. 3-54 upha 4 Bu 41-27 Andhyayana si.-va. 8 Thitihi Bhu 2-32 (1-01)

OK, let's check a Moon position during September 1-2, 2014, Bangalore, IST=+5:30, DST=0 for Lahiri ayanamsa 24°03'47".
At Sep 1, 2014, 18:00, the Moon was in 3°20' Scorpio, i.e. its longitude was 213°20'= 213*60+ 20= 12800 minutes of arc.

One nakshatra is equal 13°20'= 800 minutes of arc.
12800/800= 16 that means at 18:00 17th nakshatra (Vishakha) ended and 17 (Anuradha) started.

At Sep 2, 2014, 18:07, the Moon was in 16°40' Scorpio, i.e. its longitude was 226°40'= 226*60+ 40= 13600/800= 17 (Anuradha->Jyeshta).

That's exactly what JM shows.

If you see the errors in my calculations above, don't hesitate to disprove those.
I have elaborated many Jyotish books printed in India and almost all of them contain calculation errors.

Probably, there is something different (TZ, ayanamsa) in your printed panchanga.
If you provide an extra details like scanned page of your panchanga data and notes (what time and ayanamsa are used there)
we could find a source of the discrepancy.







If you compare JM with other panchanga, including this

http://www.panchangam.org/pdf_downlo...?month=2014-09

you may find that results are very close and JM calculation are more exact than many others.

If you select in JM a Fagan/Bradley ayanamsa, September 1, 2014, Anuradha start time will be 19:37 that is close to your time of 19:50.
Probably, Ontikoppal Panchanga uses some kind of ayanamsa that is close to Fagan/Bradley.

If we know what is exact ayanamsa value used in Ontikoppal Panchanga and how do they calculate it for specific date, we could match JM results to Ontikoppal, though it's not necessary, IMO.

Some programs and printed books use a simplified ayanamsa calculation algorithm that may cause some zodiac position and as result a time difference.

[JyotishMaster]

In Ontikoppal panchanga they use Drigganitha, the family which produces this panchanga is highly traditional and from astrological family background, they are scholars, they know all calculations very well. It is so popular that here we will not get the panchanga with in two days of release and they do not reprint again!. The time predictions of occurrences of Eclipses, Full moon and No moon days are highly accurate in their panchanga.

They mentioned corrections for different locations it includes Galige, Vighalige, Ghati, Vighati (Split minute, and Split sec etc).

In page 13 of part 2 they have given corrections to be added for different countries and for different locations of india, to get exact time.

========================
As per the panchanga which i have, the Details for Bangalore city are as follows

City: Bangalore Lat: 12-58N Lon: 77-38E
Difference Between 82(1/2)Deg to Mexico Lat And Lon: -19-28 (minus19-28 (19Minutes-28Seconds))
Correction To Sidereal Time (Seconds): +2

I need to generate panchanga for bangalore in JM as per these details.

The coordinates and other information is not relevant for nakshatras.
To calculate that we need only a sidereal Moon position and time zone to convert GMT to local time.

In case you don't know what ayanamsa use the authors of mentioned panchanga I cannot easily match their calculation. A user-defined ayanamsa may be a solution but so far you are only a person who may be need that.

JM implements more than 20 different ayanamsas used by different authors and I have provided you with a sample proving that Jyotish Master calculation are correct, the rest is a not a matter of science but of religion.

[JyotishMaster]

You may try to use a custom ayanamsa value in JM Panchanga.



It seems the ayanamsa value of 24°09'30 on 1/1/1950 reference date is close to that used in Ontikoppal ephemerides.
At least it gives a necessary 19:50 Anuradha start time at given date.

[JyotishMaster]

Those who are interested in getting Panchanga with Drig Ganitha ayanamsa may input that as user value.
At the moment we have no any trustworthy information about this ayanamsa to implement that in our list of 'standard' ayanamsa.

A Drig Ganitha ayanamsa problem is not a new issue for astrological software. This is a fragment of the discussion in one of the Yahoo groups devoted to JHora program:

To: jhora@yahoogroups.com
CC: astrolearnjyotish@...
From: pvr@...
Date: Wed, 22 Jul 2009 14:53:43 -0400
Subject: Re: [jhora] Re: Drig ganitha ayanamsa in jhora

Namaste,
whenever a chart is casted with Drigganitha panchangam and compared with Jhora chart casted with default options(lahiri) there is always a difference of approximately 2 months in Dasha balance and also few planets are displaced in position in few divisional charts.

That only means their "drigganita" is incorrect or they use a different ayanamsa or they use different definitions (e.g. apparent positions instead of true positions etc).

By definition, formulas used in drigganita are to be updated constantly, based on the best available observations of the day. JHora uses Swiss Ephemeris, which is based on the latest NASA models. If somebody else uses less accurate or older observations to model planetary movements, one can get different calculations. Some planets can of course be off in some divisional charts and dasa dates can be off.

You can play with different settings (e.g. geocentric vs topocentric, true vs apparent etc, which impact Moon's position considerably) and with ayanamsa of course. If you still cannot match the panchanga you follow, nothing can be done about it. If panchanga is based on old planetary models, we cannot match it. JHora is based on the latest and the most reliable drigganita of the day.

Best regards,
Narasimha

Why there is no drig ganitha ayanamsa in Popular softwares like JHora ,Parashara light etc
It is very evident from the shloka of BPHS itself that Drig ganitha should be used for calculating the position of planets and other stuffs

There is always a difference of approximately 2 months in dasha duration ,change in position mandi in navamsa,sandhi planets changing rashi due to differences between Lahiri and Drigganitha ayanamas
It seems like a group of astrologers are favouring Lahiri ayanamsa just because they are following them.
when softwares like jhora can allow multiple ayanamsa like Yukteswar,chandrahari ,they tend to avoid Drigganitha and vakya which have the backing of ancient rishis and authorities

DO the astrologers who make software have favouritism towards a particular ayanamsa?Are they not capable enough to integrate ayanamsa like Drig ganitha and vakya inspite of them having a long list of ayanamsa which have no backing from ancient authorities.

Drigganitha is also the most scientific ayanamsa got after making corrections for minor differences occuring through the age

BPHS
8-9. yasmin kaale...drig ganita ekatam,

the positions of the grahas are to be taken, as per Drig ganit. This is again important for us toknow that the Parashara school recommends Drig Ganita. India is a
vast country with one religion (I refer to Hinduism) but several different cultures. The Panchang system is different in different parts of the country. So following a standard system should be effective.