Search found 15 matches

by Asterix
16 Jul 2019, 16:14
Forum: ASTAP General
Topic: JPL DE with Pascal unit hns_uDE
Replies: 1
Views: 8890

Re: JPL DE with Pascal unit hns_uDE

Well, I could now at least compile the unit. It looks however like the FileStream is intended for a different input than the JPL ascii files which I offered to read. Your code does not seem to distinguish between the JPL's header file and its data files. Could it be that you read directly JPL's bina...
by Asterix
13 Jul 2019, 15:01
Forum: ASTAP General
Topic: JPL DE with Pascal unit hns_uDE
Replies: 1
Views: 8890

JPL DE with Pascal unit hns_uDE

Hello Han, I try now to implement this unit in my program and have a question related to the input parameters of function load_de_file2(jd: double; path1:string; var jdstart,jdend: double): boolean;{load de file} The selected DE423 files have been saved in a folder containing ...\423\ascp1800 ...\42...
by Asterix
26 Jun 2019, 14:29
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

Han, it looks like I did not implement "my" nutation correctly. May I ask you for your Pascal source code for nutation_correction_equatorial(ra_eq, dec_eq); aberration_correction_equatorial(ra_eq, dec_eq); Or did I miss them when searching through your various source files? Thanks and regards, Marce...
by Asterix
24 Jun 2019, 14:37
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

Thank you, Han, I found it, and yes before adding aberratioon. What Nutation model are you using, may be the JPL DE one? Do you have by any chance also the Nutation IAU 2000A or 2000B models as Pascal source code or know someone else who has it and is prepared sharing it?
by Asterix
21 Jun 2019, 19:13
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

2) My undersunding is that the prcession model 2006 (on which it is based) combines both, precession and nutation. Is this also true for this long term model, or did it require to multiply the resulting precession matrix additionally also with a nutation matrix? It seems my understanding was wrong,...
by Asterix
21 Jun 2019, 09:07
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

Han, Sorry, I realised only afterwards that your comment: "The altitude measurements are for me of less interest." related probably to the reduced number of decimals for showing the result ALTtrue in the horizon system. With the one decimal shown the result agrees with others but it does unfortunate...
by Asterix
17 Jun 2019, 16:09
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

My program reports an altitude of 5.0. I do not include observatory height nor the pear shape of the Earth. The altitude measurements are for me of less interest. Thank you, Han, for giving it a try. I guess the conversion to Horizon coordinates should not be a problem and that the reason for your ...
by Asterix
16 Jun 2019, 00:00
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

"I'm not aware of anybody is using sidereal time. Maybe in 1867. Now it is UTC or Julian" Sorry, Han, but that is how these historical observations are documented. Before closing down here also the other one. Thanks and regards, Marcel Can you notice why the following case seems to produce a less ac...
by Asterix
15 Jun 2019, 23:27
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

Han, you mixed-up the times.
Recordet time of observation was 21:21:27.9 local sideral time (LAST)
The result consists in finding first the corresponding UT1 which was found to be 21.747813289 (or 21:44:52.1)
My result relates to this time.
by Asterix
15 Jun 2019, 21:43
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 53909

Re: Astrometry: Looking for Pascal/Delphi functions

My program reports for that date, time and position an altitude of 11.1 degrees without any atmospheric refraction. The best is to check a few examples in one of the Meeus books. For planetary ephemerides you could use JPL https://ssd.jpl.nasa.gov/horizons.cgi?s_target=1#top Han, it looks like your...