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Author
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Topic: How do you calculate the CURRENT longitude of a star?
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SunAscendant
Knowflake Posts: 2569
From: California
Registered: Oct 2014
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posted April 03, 2019 06:17 PM
  
I know that longitude of a fixed star is expressed as the degree, zodiac sign and exact minute of where the star is, but unfortunately I can only find the position of where the fixed stars were in the year 2000. I know fixed stars barely move at all over the course of 20, 30 and even 40 years but I would still like to know the equation for calculating the exact current position of a fixed star. I'm currently taking an astronomy class that's focused only on the stars and galaxies and am curious where the stars are now in present time zodiac wise.For example: The longitude of Sirius in the year 2000 was 14Cancer05. What is the longitude of Sirius today? It has a period of 51.5 years meaning in about 2051 it'll move a degree and be at 15Cancer, but today on April 3rd, 2019 what would be the exact degree? Also, how would I find the degree for April 22nd, 1992 (my birthday)? My ascendant is at 12Cancer08 and I want to see exactly how far my Ascendant was from Sirius at the time I was born. IP: Logged |
Randall
Webmaster Posts: 109277
From: From a galaxy, far, far away...
Registered: Apr 2009
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posted April 04, 2019 01:33 PM
Bump!IP: Logged |
astri
Knowflake Posts: 228
From:
Registered: Nov 2018
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posted April 04, 2019 03:59 PM
You can check it via the extended chart selection on astro.comI already checked it for you: Sirius was indeed at 14°05 in Cancer in the year 2000, but it was and still is in retrograde, so now it is at 13°49. In 2051, it will be at 14°48
In 1992, it was at 13°59 I check this with the natal + solar return chart, because then you can also fill in a date and see the degrees and minutes in the outer circle where Sirius will be. I've checked also to see if it differs per month via the lunar chart, but it seems to only shift a minute per year. IP: Logged |
SunAscendant
Knowflake Posts: 2569
From: California
Registered: Oct 2014
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posted April 07, 2019 10:49 PM
quote:
Originally posted by astri:
You can check it via the extended chart selection on astro.comI already checked it for you: Sirius was indeed at 14°05 in Cancer in the year 2000, but it was and still is in retrograde, so now it is at 13°49. In 2051, it will be at 14°48
In 1992, it was at 13°59 I check this with the natal + solar return chart, because then you can also fill in a date and see the degrees and minutes in the outer circle where Sirius will be. I've checked also to see if it differs per month via the lunar chart, but it seems to only shift a minute per year.
Do you know the equation? I don't want to check the ephemeris, I want to try and see if I can do the math myself.
IP: Logged |
astri
Knowflake Posts: 228
From:
Registered: Nov 2018
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posted April 08, 2019 09:39 AM
quote:
Originally posted by SunAscendant:
Do you know the equation? I don't want to check the ephemeris, I want to try and see if I can do the math myself.
no, sorry. IP: Logged | |
Lindaland
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