Transiting Sun exact conjunct Sirius each year.

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SteveS
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Re: Transiting Sun exact conjunct Sirius each year.

Post by SteveS » Mon Nov 26, 2018 10:26 am

Will do Jim on copying user files before installing SF 9. Thanks.

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Re: Transiting Sun exact conjunct Sirius each year.

Post by SteveS » Thu Apr 25, 2019 3:23 am

Jim, I received update of SF 9 last week, and with the help of my friend we went over your instruction for running exact transits to fixed stars (got it), and now can do lots of mundane research.

I ran in SF 9 the exact transit of Sun to Sirius, and calculated for New York, July 5, 1929, a time of 11:43:22 AM EDT. Will you double check with your SF Version and see if you get the same time of 11:43:22 AM. Thanks
Last edited by SteveS on Thu Apr 25, 2019 5:55 am, edited 1 time in total.

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Jim Eshelman
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Re: Transiting Sun exact conjunct Sirius each year.

Post by Jim Eshelman » Thu Apr 25, 2019 5:47 am

SteveS wrote:
Thu Apr 25, 2019 3:23 am
I ran in SF 9 the exact transit of Sun to Sirius, and calculated for New York, Jan 5, 1929, a time of 11:43:22 AM EDT. Will you double check with your SF Version and see if you get the same time of 11:43:22 AM. Thanks
Of course. The first thing I notice is that, since Sirius is in Gemini, this can't occur in January but will always be in early July (but, since it's July 5), that was probably a typo.

On July 5, 1929, Sirius was at 19°20'51" Gemini. Sun conjoined this at 11:43:19 AM EDT, within 3 seconds of what you calculated..The 3 seconds could be a difference of the two SF versions or a difference in our working methods (I forget how I suggested you calculate this). Since Sun moves 0°00'01" in 25 seconds of time, I'm not too worried about a 3 second difference.

But, for the record, here's what I did: First, I calculated a chart for noon on July 5, 1929 to get the longitude of Sirius as 19°20'51" Gemini. Then, I calculated a solar return for Sun at that longitude. Then I checked, on the resulting chart, that Sun and Sirius were the same second of longitude.

You got it! (And it's a stunningly malefic chart for the economy.)
Jim Eshelman
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Jim Eshelman
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Re: Transiting Sun exact conjunct Sirius each year.

Post by Jim Eshelman » Thu Apr 25, 2019 5:51 am

Ah, I see how you got 10:43:22. I used Dynamic Events to calculate a transit-to-transit aspect of Sun to Sirius for 1929 (Sun only under Transits, Sirius only under User, starting date 1/1/29 for one year). I get 11:43:22 instead of 11:43:19.
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SteveS
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Re: Transiting Sun exact conjunct Sirius each year.

Post by SteveS » Thu Apr 25, 2019 5:54 am

Sorry Jim, yes I meant to write July 5th instead of Jan 5th. Yes, I have got it :D , and understand how we each got our 3 second difference. 8-)

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Re: Transiting Sun exact conjunct Sirius each year.

Post by Jim Eshelman » Thu Apr 25, 2019 6:17 am

I think we can live with a 0°01' difference on the angles from two different ways of calculating this :)

On July 5, 1929, Sun moved 0°57'13" in one day, or 3,433". That means that in 0:00:03 of time (3/86,400 of the day, since there are 86,400 seconds of time in the day), Sun moves 0.1" of arc.
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