|Re: Sun Position Programs|
Message #8 Posted by Karl Schneider on 17 Apr 2006, 12:07 a.m.,
in response to message #7 by Etienne Victoria
Thank you for mentioning the programs for planet position in the MoHPC HP-41 Software Library, which I'd forgotten about. The suite of routines requires 2946 bytes, which exceeds the 2240-byte main memory of the HP-41. Thus, the user would need to choose which programs to use, and keep the others in Extended Memory if desired. (This requires an X-Memory module for the HP-41C/CV). This application could be well-suited to the HP-42S, which has more than enough memory, but lacks a clock, time/calendar functions, and expandability.
There are at least two other applications:
- The "Sun Altitude, Azimuth, Solar Pond Absorption" program from the HP-41 Users' Library Solutions Solar Engineering book. Scans of this book may be purchased on CD or DVD from "The Other Site", which can be found by following www.furlow.org.
- A program submitted in 1986 by Tom Sherman called "Sky Map and Compass" will give good answers for azimuth and elevation angles of the following: Sun, Moon, Venus, Mars, Saturn, Jupiter, and many navigational stars. The program as written is compact -- only 165 lines (414 bytes) -- because it utilizes functions and routines from the HP-41 Navigation Pac (required) and the Time Module (required if using an HP-41C/CV). At least one Memory Module or the Quad Memory Module is required if using an HP-41C. I do not have a source code listing in electronic or magnetic form.
Edited: 17 Apr 2006, 1:37 a.m.