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Primary Directions from Zoller's Course
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jventura



Joined: 04 Jan 2011
Posts: 292
Location: Portugal

Posted: Fri May 15, 2015 1:18 pm    Post subject: Reply with quote

Lazarus wrote:
Joao Ventura those are helpful articles you've written. I'll probably have to reread them. One thing that would make them clearer is if you actually worked out the examples mathematically instead of just giving the formula.


Well, in truth I derived the formula from the picture which is immediately above [I'm talking about this formula: Arc = (PropDist Promissor – PropDist Significator) * SA Promissor].

But I guess a concrete example is quite illustrative. If you post here the chart data, and which directions you would like to calculate (only direct semi-arc directions), I may find the available time to show how you can use the formula above to manually calculate the directions.


Regards,
Joćo Ventura
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Lazarus



Joined: 10 Dec 2014
Posts: 88

Posted: Fri May 15, 2015 3:29 pm    Post subject: Reply with quote

The Ascensional Difference of the MC was calculated like this

SinAD=(tan21d08m)(tan40dN43m)
=(0.386536)(0.860464)
=0.33269
AD=Sin-1 (0.332669)
=19.43085 = 19d26m

Then OAMC = RAMC + AD
63d05m - 19d26m = 43d39m (THIS GAVE THE WRONG ARC IN THE END)
By addition it is 63d05 +19d26m = 79d02m (THIS GAVE THE CORRECT ARC IN THE END)

Neither the RA or AD is a negative value so subtraction does not end up giving addition in this case...
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Lazarus



Joined: 10 Dec 2014
Posts: 88

Posted: Fri May 15, 2015 4:01 pm    Post subject: Reply with quote

The chart data is:

March 24, 1990 4pm Manhattan NY
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