James's Plan13 more closely matches SGP, ... it does not do the same as SGP4. Though I do admit that most people will not see much difference in the results (its only the purists that get wound up about the errors).
From: Paul Williamson [mailto:firstname.lastname@example.org]
Sent: Friday, January 15, 1999 11:24 PM
Subject: Re: [amsat-bb] BASIC SGP4 Algorithm wanted
At 04:02 PM 1/15/99 -0700, Randy Stegemeyer wrote:
> Does anyone have a copy of the SGP4 algorithm in BASIC they could
>send me? I have a copy in FORTRAN, and I could rewrite it, but I didn't
>want to spend the time if it was already available somewhere. If you
>have a copy, or could recommend a source, please let me know. Thanks!
A substantial subset of SGP4 (the one usually used in amateur
radio applications) is available in BASIC (with an explanatory
article) at http://www.amsat.org/amsat/articles/g3ruh/111.txt
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