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Author Topic:   Calculating declination midpoints
Stellia
Knowflake

Posts: 176
From: Yorks, UK
Registered: Jan 2017

posted April 19, 2017 11:38 AM     Click Here to See the Profile for Stellia     Edit/Delete Message   Reply w/Quote
Can anyone please explain in relatively simple terms how I can calculate declinations for midpoints please?

I found an old link on here that showed a chart of parallel/contra-parallel aspects to midpoints, using a Keller style chart, but that didn't show the actual latitudinal declination.

And I previously found this link http://www.astrologysoftware.com/resources/articles/getarticle.asp?ID=52&orig= which left me honestly none the wiser.

I'm fairly sure that it's not as simple as subtracting big number from small, especially if one planet is north and the other south.

So... some questions!
* Are declinations for a particular point always the same or does it change depending on time of year/day etc? eg is 3deg Leo always the same declination?
* Is there any online software that will help me figure these out?
* If not, how does one find a starting point to map points to please? Eg - manually mapping points onto a circular chart - where do you even start?

Huge thanks in advance!

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Kannon McAfee
Moderator

Posts: 2255
From: Portland, OR - USA
Registered: Oct 2011

posted April 19, 2017 06:13 PM     Click Here to See the Profile for Kannon McAfee     Edit/Delete Message   Reply w/Quote
Stellia,

If you want to calculate declination midpoints for contra-parallels, its pretty simple: any two points equidistant north/south of the celestial equator have the celestial equator as their midpoint. So you can start with those. Example: Mars 22° North, Venus 22° South: midpoint = 0° or Celestial equator.

As for the midpoints of declination positions of planets that are not in aspect, but are on the same side north/south of the equator, it is the basic math of finding the difference of their positions, like Mars 23° North and Venus 1°N [23-1 = 22°]. 22° is halved = 11, which is added to the smaller value, Venus [1+11 = 12°] or subtracted from the larger value, Mars [23-11 = 12°].

It is only slightly trickier to find the midpoint between planets on opposite sides of the celestial equator. Don't get confused with the (+) and (-) symbols. It is better to learn North (+) and South (-). That way when doing adding and subtracting, you don't confuse yourself with the plus and minus symbols that indicate the planet position.

Mars 13° North and Venus 1° South = 14° between them. Because they are on opposite sides of the celestial equator we add their positions for the sum to be halved, rather than subtracting. Halve 14° and you get 7° to add to Venus [1 South +7 = 6° North] or to subtract from Mars [13 North -7 = 6° North].

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Stellia
Knowflake

Posts: 176
From: Yorks, UK
Registered: Jan 2017

posted April 19, 2017 07:15 PM     Click Here to See the Profile for Stellia     Edit/Delete Message   Reply w/Quote
Thanks Kannon! Certainly seems a lot simpler than I'd made it out in my head. (Don't ask what I was thinking, suffice to say it was hugely overcomplicated)

I'll give it a try

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Stellia
Knowflake

Posts: 176
From: Yorks, UK
Registered: Jan 2017

posted April 19, 2017 07:30 PM     Click Here to See the Profile for Stellia     Edit/Delete Message   Reply w/Quote
[lightbulb moment]

Thank you! Think I have it working

Final follow-up question - if you're looking at synastry, I think you said take the orb down to 1deg elsewhere - what orb would you use with midpoints please?

Thanks so much for sharing your valuable insight

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Kannon McAfee
Moderator

Posts: 2255
From: Portland, OR - USA
Registered: Oct 2011

posted April 19, 2017 07:31 PM     Click Here to See the Profile for Kannon McAfee     Edit/Delete Message   Reply w/Quote
Well I wouldn't want to keep you from attaching your astrolabe and calculator to your rooftop lazyboy!

------------------
The Declinations Guy
Rising Sign Descriptions

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Randall
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From: From a galaxy, far, far away...
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posted April 22, 2017 03:35 PM     Click Here to See the Profile for Randall     Edit/Delete Message   Reply w/Quote

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