26
Petr wrote:
I just added an option to set custom Ayanamsa.
There are two possible ways in extended settings:
https://horoscopes.astro-seek.com/traditional-astrology
A) Ayanamsa of your own choice
- this option overrides other settings and set this Ayanamsa manually
(independently on the date of birth)
B) +-Offset from another Ayanamsa
- this option can be used to set slightly offset from another chosen listed Ayanamsa (Lahiri, Raman, KP, Fagan-Bradley etc...)
Can you please take a look if everything works correctly?
Petr, this is great! Both methods work, but I don't think in practice the "of your own choice" will be used much, because it will mean working out your own new and different ayanams for every new date of chart, calculating precession each time etc. It's good to have this option if someone wants to use unorthodox (or traditonal Indian "idealised") rates of precession.

But the offset option is perfect. This is first time I've been able to do an offset from a galactic equator option - I use -1°40 from the "GE at 5° Sg". This is what I've done in practice since 2005, placing GE in middle of of naksatra Mula ("the root"), i.e. at 6°40 Sg. I usually have to subtract about 30'15" from Lahiri, or about 24' I think from Krishnamurti, but as there's an old and a new Lahiri and two versions of KM in circulation, offsetting directly from a GE position is much neater.

It's good to see the GE/ecliptic intersection being included more as a sidereal anchor point, as John Addey suggested in Harmonics in Astrology in 1976. Ernst Wilhelm uses or has used this, also at 6°40 Sg and calls it "Ardra galactic plane" (see Swiss Eph site http://www.astro.com/swisseph/swisseph. ... c502931330 )
But Wilhelm was using a very slightly different calculaton for the ecliptic position of the galactic equator, I think, when I checked a few years ago. I had come up with the same (within < 1' arc) as you seem to be using for this, putting the GE on the winter solstice point (270° tropical) in late 1998. I think I got the figures first from a table published by Michael Erlewine which I can't now locate, but the figures are also buried in this interesting article on galactic structures by him (values for year 1950):
http://www.astrologysoftware.com/commun ... asp?ID=178
I'd be interested to know the source you used to pinpoint the ecliptic position of the GE - the Swiss Eph, which apparently has integrated the recent Chinese tweaking of the position?
Anyway, thanks again, this is a great feature!
Graham
Last edited by Graham F on Tue Apr 24, 2018 10:26 am, edited 1 time in total.

27
Graham F wrote: Petr, this is great! Both methods work, but I don't think in practice the "of your own choice" will be used much, because it will mean working out your own new and different ayanams for every new date of chart, calculating precession each time etc. It's good to have this option if someone wants to use unorthodox (or traditonal Indian "idealised") rates of precession.

But the offset option is perfect. This is first time I've been able to do an offset from a galactic equator option - I use -1°40 from the "GE at 5° Sg". This is what I've done in practice since 2005, placing GE in middle of of naksatra Mula ("the root"), i.e. at 6°40 Sg. I usually have to subtract about 30'15" from Lahiri, or about 24' I think from Krishnamurti, but as there's an old and a new Lahiri and two versions of KM in circulation, offsetting directly from a GE position is much neater.

It's good to see the GE/ecliptic intersection being included more as a sidereal anchor point, as John Addey suggested in Harmonics in Astrology in 1976. Ernst Wilhelm uses or has used this, also at 6°40 Sg and calls it "Ardra galactic plane" (see Swiss Eph site http://www.astro.com/swisseph/swisseph. ... c502931330 )
But Wilhelm was using a very slightly different calculaton for the ecliptic position of the galactic equator, I think, when I checked a few years ago. I had come up with the same (within < 1' arc) as you seem to be using for this, putting the GE on the winter solstice point (270° tropical) in late 1998. I think I got the figures first from a table published by Michael Erlewine which I can't now locate, but the figures are also buried in this interesting article on galactic structures by him (values for year 2000, I think):
http://www.astrologysoftware.com/commun ... asp?ID=178
I'd be interested to know the source you used to pinpoint the ecliptic position of the GE - the Swiss Eph, which apparently has integrated the recent Chinese tweaking of the position?
Anyway, thanks again, this is a great feature!
Graham
Hello Graham,
thank you for your feedback.

It was my first thoughts, that offset from Galactic Equator at 5° Sg could be probably the most practical option (I have seen several tables reffering to offset from this GE 5°Sg ayanamsa); but I don't work with sidereal much, so I didn't know which option should I give a priority.
I just re-arranged the order of custom ayanamsas :)
1) offset from GE 5° Sag;
2) offset from other listed ayanamsas;
3) "of your own choice" (maybe someone will use it for some kind of unorthodox research one day);
Image
Graham F wrote: I'd be interested to know the source you used to pinpoint the ecliptic position of the GE
I actually didn't find any exact equation formula for GE at 5°Sg :???:, so I'm using a "roundbaout":
- Raman ayanamsa equation formula (book by Dev Bhattacharyya) + correction by nutation + offset -02°35'35"

28
Peter wrote
I actually didn't find any exact equation formula for GE at 5°Sg Confused, so I'm using a "roundabout":
- Raman ayanamsa equation formula (book by Dev Bhattacharyya) + correction by nutation + offset -02°3
Well it seems to work out very very nearly the same as using Erlewine's tables (given in tropical for 1950) and as Jean Meeus's values for the tropical position of the GE in 1998, so that's reassuring!
Many thanks again!
Graham
(BTW, I didn't mean to suggest that the galactic equator option should necessarily be listed first, most siderealists will prefer to use or adapt a named and known ayanamsa from the list, but thanks anyway!)
Last edited by Graham F on Tue Apr 24, 2018 10:26 am, edited 1 time in total.

29
Graham F wrote:Peter wrote
I actually didn't find any exact equation formula for GE at 5°Sg Confused, so I'm using a "roundabout":
- Raman ayanamsa equation formula (book by Dev Bhattacharyya) + correction by nutation + offset -02°3
Well it seems to work out very very nearly the same as using Erlewine's tables (given in tropical for a given year) and as Jean Meeus's values for the tropical position of the GE in 1998, so that's reassuring!
Many thanks again!
Graham
(BTW, I didn't mean to suggest that the galactic equator option should necessarily be listed first, most siderealists will prefer to use or adapt a named and known ayanamsa from the list, but thanks anyway!)
Thanks for reassuring!
It's good to know it works also using this "roundabout" :)

30
Hello,

there is a minor update and I just added:

Antiscia/Contra-Antiscia calculator and chart:
https://horoscopes.astro-seek.com/traditional-astrology
Image
Last edited by Petr9 on Tue Sep 01, 2020 7:35 am, edited 1 time in total.
===
https://horoscopes.astro-seek.com
https://horoscopes.astro-seek.com/traditional-astrology
https://es.astro-seek.com (ES)
https://de.astro-seek.com (DE)
https://ru.astro-seek.com (RU)
https://it.astro-seek.com (IT)
https://tr.astro-seek.com (TR)

32
Astraea wrote:Petr9, your program is a gem. You've made it easy to investigate factors that are difficult and/or time-consuming to calculate, and your graphics are beautiful. Thank you!
Thank you Astraea. I'm happy to hear that.

33
Hello, I just updated this traditional astrology calculator and it calculates both profection methods now:

- A) Medieval "Continuous" profections
moving continuously by profection key (30° for 1 year; 360° for 1 year, etc.)

- B) Hellenistic "Annual" profections
moving once a year on birthday

https://horoscopes.astro-seek.com/annua ... calculator

https://horoscopes.astro-seek.com/traditional-astrology

Image
===
Image

I also would like to announce, that most of website is available in Italian language now
https://it.astro-seek.com
(maybe there is someone speaking this language :))
Last edited by Petr9 on Thu Jan 14, 2021 7:18 pm, edited 2 times in total.

34
Hello, there is a new calculation feature:

- The Progressed Full Moon - Progressed Lunation Cycle
- Progressed Full Moons/New Moons/Eclipses
- positions in Natal houses
- conjunctions with Natal planets


https://horoscopes.astro-seek.com/progr ... -astrology
Image
===
Last edited by Petr9 on Thu Jan 14, 2021 7:18 pm, edited 1 time in total.
===
https://horoscopes.astro-seek.com
https://horoscopes.astro-seek.com/traditional-astrology
https://es.astro-seek.com (ES)
https://de.astro-seek.com (DE)
https://ru.astro-seek.com (RU)
https://it.astro-seek.com (IT)
https://tr.astro-seek.com (TR)