HP-71B Software for navigation

[Erwin]

Hello,

fiddling around with the Ephemerides data - i didn't come close to a solution. Basically the navigation program consist of 3 programs.

• The main program
• Perpete program
• Epimenis program
  

the 2nd and 3rd program is necessary for doing astro navigation. In my previous post I compared the calculated parameters with those of online calculators (i.e. http://www.onboardintelligence.com/ or http://www.onboardintelligence.com/)- and it looks like that something ist wrong in the main program.

The Perpete program contains parameters for stars, moon, sun, ... but the data seems outdated and I can't find out how to update them. The source for the data used in this program is not available - only the web-site.
The easiest way would be to change the data in the program - like this from 1969:
0750 ! List of DATA containing the position of the stars in 1969
0760 'SIR': DATA SIRIUS,-16.6722-.0361*(T2-.69),259.0542+.0158*(T2-.69)
0770 'CAN': DATA CANOPUS,-52.6783,264.1854
0780 'VEG': DATA VEGA,38.7539,81.0279

For the planets exists calculations too. I tried to compare the data from the program to the nautical almanac from this year but can't find the data for this.

For
1170 'DIP': DATA DIPHDA,-18.1564,349.4917
1180 'HAM': DATA HAMAL,23.3167,328.645
1190 'KOC': DATA KOCHAB,74.2822,137.3058
The data comes close to the almanac data from 1.1.1969

The Epimenis program waits for input data of ephemerides and stores them in a data file, but no remarks how and in which way to input them. Ephemerides data ist available on the net i.e. here: http://www.tecepe.com or https://www.thenauticalalmanac.com

Has anybody an idea how to go further to use this navigation program?

I made an update oft he documentation (translation failures, WGS84 eccentricity) in my previous post. The translation in english of the main program will hopefully be finished on this weekend :-)

best regards
Erwin