On Wed, 12 Dec 2001, Roger wrote: > Hi, > I'm looking for a command line program that if given the TLE, time and > location (mine), would calculate the latitude and longitude of where directly > over earth the object is. SatTrack has a few command-line utilities for pass prediction. Bester Tracking Systems (http://www.bester.com) seem to have removed the free version from their website, but it seems to be available ready-packaged for some systems: FreeBSD: ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/astro/sattrack-3.1.6.tgz Debian Linux: http://packages.debian.org/stable/hamradio/sattrack-x11.html > Short of that, where would I find the formula for calculating the location? The "formula" you're after is the SGP4/SDP4 satellite propagation model, which is documented in a number of places (check the FAQ), plus some vectorial computation to get the azimuth and elevation at a given time. If you're interested in writing your own program, you can have my C language SGP4/SDP4 source code. It's a translation of NORAD's Fortran code and isn't extensively tested. See http://www.eta.chalmers.se/~b/satlib/ Happy hacking & clear skies, Magnus ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 12:51:31 EST