Search found 15 matches

by Asterix
15 Jun 2019, 13:03
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 52826

Re: Astrometry: Looking for Pascal/Delphi functions

Hello Han and Patrick, It looks like the version of converting the data from a star catalogue which I use has been simplified. Does one of you have a Pascal version for a correct conversion of RA, Dec, Distance(Px?), proper motion, and radial velocity from catalogue values to the time of interest? T...
by Asterix
14 Jun 2019, 14:36
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 52826

Re: Astrometry: Looking for Pascal/Delphi functions

Hello Han, Thank you for the additional information. I am not yet ready to install the JPL DE data files. In the mean time I tried to improve my program to extend the functions and numerical formats to better than the about 1 arcsec differences which I achieved with my previous version. Before movin...
by Asterix
08 Jun 2019, 14:54
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 52826

Re: Astrometry: Looking for Pascal/Delphi functions

Thank you, Patrick, for your code and the information on the JPL ephemeris. I have so far not used them myself, only in connection with an other program. In order to avoid applying nutation twice my following question: Is with DE430 or DE431 nutation always added or only optional? It looks like ther...
by Asterix
06 Jun 2019, 18:34
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 52826

Re: Astrometry: Looking for Pascal/Delphi functions

Hello Han, Thank you for this fast reply! I downloaded your source codes and found the indicated pas-files. I will see how I can use them; I will give it a try. The weak part seems to remain their NUTEQU.PAS where they neglected all contributions smaller than 0.1 arcsec. Again, many thanks, Han. Mar...
by Asterix
06 Jun 2019, 17:04
Forum: ASTAP General
Topic: Astrometry: Looking for Pascal/Delphi functions
Replies: 25
Views: 52826

Astrometry: Looking for Pascal/Delphi functions

Dear all, Until now I used for the astrometry calculations the Pascal/Delphi programs described by Mountenbruck and Pfleger in https://www.amazon.de/Astronomie-mit-dem-Personal-Computer/dp/3540577017 The claimed accuracy of their functions and procedures of about 1 arcsec was sufficient for my purpo...