Programming Handheld Calculators

[PANAMATIK]

(09-13-2015 11:13 AM)Thomas Klemm Wrote:  Programming Handheld Calculators
A reminiscence about programming in the era before personal computers
by Paul Lutus

There was an earlier thread: HP 65/25 shout-out in interview with Paul Lutus

I've added the three programs mentioned in the article to the HP Software Libraries:

• (HP-25) Space Flight
• (HP-67) Solar Calculator
• (HP-67/97) Planetary Ephemeris
  

Cheers
Thomas

Very nice programs. Thank you for giving the links.

I tried the Solar calculator on my HP-67. It calculates declination with nice approximation +- 1/2 degree or so. It cannot be used for astronomical navigation, but for knowing when to get up for sunrise.

I compared the results with Mike Stefanski's Nj.exe at

http://www.kowoma.de/gps/astronav/nautjahrbuch.php

This program has an excellent accuracy and when having a look to its mathematics, it never can be entered into a vintage handheld calculator. BTW I ported this old DOS Pascal program to a VS2013 C# application last week

Bernhard