Re: How to turn ecliptic longitude into solar declination?

2022-10-16 Thread Michael Ossipoff
Okay, that’s good to hear. …& thanks clearing it up. On Sun, Oct 16, 2022 at 3:54 PM Steve Lelievre < steve.lelievre.can...@gmail.com> wrote: > Michael, > > On 2022-10-16 1:40 p.m., Michael Ossipoff wrote: > > Thank you for mentioning that I answered Steve's question. > > ...something not

Re: How to turn ecliptic longitude into solar declination?

2022-10-16 Thread Steve Lelievre
Michael, On 2022-10-16 1:40 p.m., Michael Ossipoff wrote: Thank you for mentioning that I answered Steve's question.   ...something not acknowledged by Steve for some reason. Please be assured that no slight was intended. Thank you for taking the time to reply to my question. I did not

Re: How to turn ecliptic longitude into solar declination?

2022-10-16 Thread Michael Ossipoff
Frank-- Thank you for mentioning that I answered Steve's question. ...something not acknowledged by Steve for some reason. I didn't notice that when I first read your post. Thanks for setting the record straight ! So, to the list I just want to clarify that, when Steve asked how to determine

Re: How to turn ecliptic longitude into solar declination?

2022-10-16 Thread Michael Ossipoff
[quote] At the moment we are in Vintagarious, the first month, and you will see that each day has the symbol for Aries. [/quote] Then you have an error, because Vendemiaire doesn't roughly approximate Aries. Vendemiaire roughly approximates Libra. As for the nature of the French Republican

Re: How to turn ecliptic longitude into solar declination?

2022-10-16 Thread Frank King
Dear Steve, Michael, Werner and Fabio have provided some excellent responses to your question. If you are ONLY interested in relating three ANGLES - solar longitude, solar declination and the obliquity - then this relationship is indeed all you need: sin(lambda).sin(obliquity) =

Re: How to turn ecliptic longitude into solar declination?

2022-10-15 Thread Steve Lelievre
My thanks go Werner for his detailed and helpful response to my question, and Fabio for his interesting comments on the astrolabe. I learned some new things today, and it was nice to see a diagram of the offset circles on the back of the astrolabe. Clever. Cheers, Steve

Re: How to turn ecliptic longitude into solar declination?

2022-10-15 Thread Werner Riegler
Dear Steven, The relation of solar declination delta(t) to ecliptic longitude lambda(t) delta(t) = ArcSin[Sin[23.44]*Sin[lambda[t]] You are interested in the relation of solar declination to time since the equinox. Your formula delta(t) = 23.44*Sin(t), with t being the time (in degrees)

Re: How to turn ecliptic longitude into solar declination?

2022-10-15 Thread Michael Ossipoff
erably also for some fractions of each > ecliptic-month, such as 1/3 & 2/3. > > On Fri, Oct 14, 2022 at 10:16 PM Michael Ossipoff > wrote: > >> >> >> -- Forwarded message - >> From: Michael Ossipoff >> Date: Fri, Oct 14, 2022 at 10:16 PM

Re: How to turn ecliptic longitude into solar declination?

2022-10-15 Thread Michael Ossipoff
Ossipoff wrote: > > > -- Forwarded message - > From: Michael Ossipoff > Date: Fri, Oct 14, 2022 at 10:16 PM > Subject: Re: How to turn ecliptic longitude into solar declination? > To: Steve Lelievre > > > > > Or you could just use the ecliptic lo

Re: How to turn ecliptic longitude into solar declination?

2022-10-14 Thread Michael Ossipoff
Multiply the sine of ecliptic longitude (reckoned forward or backwards from the nearest equinox) by the sine of 23.438 or whatever the current obliquity’s exact value is). Take the inverse sine of the result. On Fri, Oct 14, 2022 at 4:57 PM Steve Lelievre < steve.lelievre.can...@gmail.com>