HP41 code to compute satellite position from TLE/keplers?

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(12-24-2014 05:59 PM)twdeckard Wrote:  ... a BASIC program for predicting satellite look at angles from keplers you get from NORAD ...

Orbit tracking programs
The best general purpose orbit tracking program available for free public use was originally written in BASIC by Dr. Thomas A. Clark. A listing of his program appears in the AMSAT publication ORBIT magazine issue #6. You can get a copy of this issue by sending $2 to

AMSAT PO Box 27
Washington, DC 20044
(This address is also good for general inquiries about AMSAT and its programs)

Tom's program has been translated into a number of dialects of BASIC, PL/1, HP-41C, etc, and are available from

Amsat Software Exchange (ASE) Box 338
Ashmore, IL 61912
(for small donations ($5-$15) to cover costs)

One of the guys running the ASE, Bob Diersing, N5AHD, runs a CBBS on (512)852-8194 where you can read some info about the available programs and get Keplerian elements for a number of satellites. Tom's article includes a very good discussion of the theory behind his program, which is a general one handling elliptical orbits as well as circular ones. It uses the "Keplerian Element" sets derived by the North American Air Defense Command (NORAD)
Source file

as well as
ORBIT magazine issue #6

BEST!
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