Re: Ground track calculations

From: Marco Langbroek (
Date: Thu Aug 31 2006 - 03:50:12 EDT

  • Next message: Russell Eberst: "2006AUG29-30.OBS"

    Bill Frost wrote:
    > Hi Tom,
    > Everyone has their favourite. Mine is Orbitron and by coincidence 
    > Here's the data from a few seconds ago:
    > Lon	28.0621° W
    > Lat	49.1764° N
    Just a remark that when it concerns very accurrate geographic positions, the map 
    datum of the given coordinates becomes of concern.
    I believe the standard SGP routine used by most software provides coordinates in 
    WGS72 datum? GPS-es on the other hand and for example our Dutch topographic 
    maps, employ the WGS84 datum.
    The difference between WGS72 and WGS84 is not of much concern (it is a 
    difference of about 10 yards maximum) but for some other map datums, it can go 
    up to a few hundred yards.
    So when a few hundred yards matter, take note of the map datum used and convert 
    if necessary!
    - Marco
    Dr Marco Langbroek  -  SatTrackCam Leiden, Cospar 4353
    Leiden, the Netherlands. 52.15412 N,  4.49081 E (WGS84), +0 m ASL
    Station (b)log:
    Atom RSS:
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:

    This archive was generated by hypermail 2b29 : Thu Aug 31 2006 - 03:52:02 EDT