Thanks to Dr T.S. Kelso for making available his Turbo Pascal code of NORAD SGP4/SDP4 orbital models which I referenced to create code in SkyTrack.
In addition, thanks to Dr Kelso for permitting direct links to his website at for the downloading of TLE files.

Various calculations were used from Astronomical Algorithms Second Edition 1998 by Jean Meeus

Thanks to those who assisted with beta-testing of SkyTrack.
Thanks to John Eccles for maintaining and supporting Satellite Tracker from 2013-2019.

SkyTrack Copyright Ⓒ 2018-2022 Brent Boshart All Rights Reserved
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