Sun amd Moon data for GPS Programs

[derez]

The attached is a module to be attached to GPS programs.
Given the coordinates and date from the GPS it calculates the Sunrise and Sunset times, the moonrise and Moonset times and the moon phase for that date with a photo of the moon.

The algorithms are translations of what I found in the net, except for the algo of the moon phase for which I used part of the algorithm of date translation from Gregorian Calendar to Hebrew calendar, and this is the most accurate algorithm.

(If you are interested in the Hebrew calendar - ask me for the full algo).

The main module in the attachment is just a tool to run the module, instructions for the integration appear in the header of the module.
There are provisions for use with either GPS.dll or GPSDriver.dll



The photos should be put with their "moons" directory next to the application.

Happy navigation !

Updated to ver 2, to make the module independent of the type of GPS library.

After Alfcen remark, I updated it to ver 3 to be able to work independently of any other gps related code, with gpsdriver.

Edit: see in #16 updated and corrected astro.bas module, after bugs found by Agraham and Jony. Thanks.

[Standa]

Thank you very much. Algorithm in your example is first after long time, what is really working . I write program using your example. I hope in two days I put it here .

[alfcen]

Hi David,
I've been absent from the forum for a couple of months and was excited at
finding your Sun and Moon application (which I haven't checked yet as I
can't get a GPS fix right now - not a problem of your program).

At the time when the GPSDriver.dll became available I have written a similar application purely with astronomy and Google Earth in mind, which you can see and download here:
alfcen - gps astro

As soon as I get my GPS running I will get back to you. Perhaps we can exchange a few thoughts without going too deep into the algorithm.

Cheers
Robert

[derez]

Welcome back Robert, I wondered what has happened to you, not responding to my cry for help

"Does anybody know a link to the moon rise and set calculation in VB or C ? I found one in basic and it does take a long time to convert it... ALFCEN ?"

but as you see I found the solution.

I am waiting your (and anyone elses) comments and ideas for improvements.

Edit
Checked your program vs mine:
In yours sunrise is 06:07 while at mine is 06:12
sunset is 19:14 vs 19:08
It might be due to different definitions of rise and set, as angles above horizon.

[wm.chatman]

Hi Mr. Derez

First I would like to thank you again for the felp on the SR/SS matter.
After a few changes and trys and reworking the code with the help from Klaus, it is working at 99.9 %. Plus minus 1 min.
As you know i am new with the GPS Algos., and new user Basic4ppc. But, not new with using a Compass out in the Field. I think you are correct when you think that this has something to do with different definitions of rise and set, as angles above horizon. I do not think there is a 100% Algo for SR/SS and MR/MS. Had a chance to few different source code on this.

take care and best Regards,
William

[alfcen]

Hello David

Couldn't test yours. After selecting GPSDriver, all I get to is a [Astro] button.
No effect on click. GPS up and running. Sure I missed something

My algorithm takes into account atmospheric refraction and altitude
as well as the sun's apparent diameter at its current distance.
Sunrise and set is when the upper limb of the sun's disk is coincident
with an ideal horizon.

I checked it with a local tide calendar. Rise is +/- 2 min, set is pinpoint.
The same algorithm is pinpoint also for rise in a VB6 app.
Need to look further into this.

Cheers
Robert

[derez]

Alfcen
It didn't work for you because you have not completed all gps code which is required. My comment " assuming..." meant that you have to complete it.
anyway - I have updated it to version 3 (in the first post) and now it should work with gpsdriver.

I don't know what the algorithm is based on, I think I reduced it to the minimum so yours is probably better. I know it does not take altitude into the calculation.

[jony]

Hi. Can you make a diferent version which will work without gps? To insert date ,Latitude , Longitude and have the result?
Also, what is the Astro.bas file ? I am newbe and dont understand that much.. ). It looks as basic4ppc , but not completed and i cant run it.. I tried to make it in a basic4ppc form, but i have errors , (Mimg is used before it is assigned any value, the same for Sunandmoon, etc.. )
I need a program that i give date ,Latitude , Longitude from a form, and have Sunrise and Sunset times, the moonrise and Moonset times and the moon phase. If anyone can help.. Thanks ,

[derez]

Jony
The astro.bas is a module, attached to my GPS navigation program.
The great idea of modules is that you can take it and attach it to other programs, using a minimal interface.
This means that it will be very easy for me or for anyone else to do what you ask for.

Can you wait few days ?

[derez]

I attach the modified Astro3 program, to work without GPS.

The date format is 3.10.2009
Lat and Long are decimal (e.g 34.82)
This can be changed in the main program.