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I used to use this one, might give you an idea of what's involved.
Photo Ephemeris[^]
PartsBin an Electronics Part Organizer - An updated version available!
JaxCoder.com
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thank you!
diligent hands rule....
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Stellarium (stellarium.org) has an observability plugin you might be interested in. I haven't used it, so cannot comment further.
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I regularly use Stellarium from Portable Apps website. It is pretty straight forward but user interface is a little difficult at first. When you initially run it, it starts slow but be patient. When it first comes up it will be full screen. If move the mouse to bottom of window a popup will display some options.
Move cursor all the way to left corner. Another vertical menu will pop up. Select the top of the menu to get to the location specification interface. It's tricky, but you can enter your location by city name.
Move cursor to bottom again, horizontal menu comes up. On the right is date and time scroll buttons.
It's a great tool. And I have confirmed its star and moon locations by going outside and observing them.
To end the program hit the power button on far right of lower horizontal menu.
"A little time, a little trouble, your better day"
Badfinger
modified 12-Feb-23 23:34pm.
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If you have a tracking telescope, Stellarium can control it for you. It is extremely powerful, and good enough for archaeoastronomy work. You can see some of it's archaeoastronomy abilities in the 'Our Forgotten Astronomy' link in my signature, if you are interested in such endeavors.
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I do not have a tracking telescope. Glad that Stellarium has such a feature. I have listened to some of your lectures about history, astronomy and religion. Pretty complicated but interesting about the links.
Funny how the stars and our lives can get intermixed. I remember seeing Haley's comet "many moons ago", one of my favorite expressions.
Thanx
"A little time, a little trouble, your better day"
Badfinger
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My favorite will always be the night I got to watch the Northern Lights almost all night long. I've only seen them that once - Incredible!
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I have seen Aurora Borealis multiple times. In Canada and U.S. The last were huge white curtains with tinge of green that lasted for hours. I was told it happens quite often at northerly latitudes above 50 deg. BTW Aurora Australis is the southern latitude version. Not seen those.
Enjoyed your discussion on the potential roots of the Samson story.
"A little time, a little trouble, your better day"
Badfinger
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Mine were green and red sheets, dancing all night. Little to no white. It was amazing!
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yup, you don't easily forget it. Amazing that it is very natural.
I guess if you see every night you are lucky but not always as amazed.
"A little time, a little trouble, your better day"
Badfinger
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thank you!![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
diligent hands rule....
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I have written several ephemerides over the years, the first being for an HP75C, using the 'Low-precision formulae for planetary positions' by van Flandern and Pulkkinen (Astrophysical Journal Supplement Series, vol. 41, Nov. 1979, p. 391-411). The paper provides a good introduction to the general problems of ephemerides, and the stated accuracy of +/- one minute of arc is extremely conservative, and for the current era +/- six seconds of arc is realistic. This ephemeris also calculates the 'First point of Ares', enabling star positions to be computed. I used this method to navigate my small yacht by sextant from Southampton UK to Pireaus Greece, with my worst landfall being one third of a nautical mile out. That was in pre-GPS days.
A more accurate methodology, but also much more compute intensive, is Pierre Bretagnon's VSOP82, subsequently developed and refined to VSOP87. The raw data tables which make the basis for the computations are out there on the web somewhere, I'm sure. When written into a program, it is spritely enough on a PC, but might tax all but top-end mobile devices.
A very good source of foundational information is the US Navy's Nautical Almanac, particularly in the 'Explanatory Supplement', a separate publication. Any year will do. Also, get a thorough understanding of the 'equation of time', as it occurs in just about every ephemeris calculation.
A couple of years ago I rewrote my original HP75C program to run on Android, and expanded it to cover not just the sun, moon, six navigational planets, fifty-eight navigational stars and Polaris, but included all ten thousand stars visible to the naked eye (given very good eyes and excellent viewing conditions  ). Even on an old Android phone it runs fast enough to be useful, although the virtual graphical sextant 'scope view is distinctly laggardly when scanning the sky.
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thank you! all these sources are very useful for me.
diligent hands rule....
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You need to understand the file format. I converted their programs from c and doubles, to c# and decimals a few years back. Government software is mostly in the public domain; I tried a few until it matched the observatories and Chinese calendars.
Format of the JPL Ephemeris Files
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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just be curious: why do you check that it meets Chinese calendar?
also I want to convert this astrolog program to C#, but I think it is too complex for my needs...
diligent hands rule....
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#Worldle #386 5/6 (100%)
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🟩🟩🟩🟩🟨↖️
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https://worldle.teuteuf.fr
process of elimination
"A little time, a little trouble, your better day"
Badfinger
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Wordle 603 4/6
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Wordle 603 3/6
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Wordle 603 4/6
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Wordle 603 3/6*
🟨⬜⬜⬜⬜
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And ... either a major crash or a milestone tomorrow:
Played: 374
Win %: 100 (Nope - a rounding error)
Current Streak: 299
Max Streak: 299
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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⬜⬜🟩🟩⬜
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Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
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Wordle 603 5/6
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Get me coffee and no one gets hurt!
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Wordle 603 3/6
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Jeremy Falcon
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Wordle 603 3/6
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"A little time, a little trouble, your better day"
Badfinger
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...Mrs. Buster Boy! ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif) ![Beer | [beer]](https://www.codeproject.com/script/Forums/Images/beer.gif) ![Jig | [Dance]](https://www.codeproject.com/script/Forums/Images/jig.gif)
/ravi
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