Tangent Plane?

Chris Maness · 2018-12-15T16:02:42-08:00

What Earth model is used to generate a tangent plane for AZ/EL coordinates? Is it a Geoid datum, or an ellipsoid? Thanks, Chris Maness

Chris Maness All Messages By This Member #3464 What Earth model is used to generate a tangent plane for AZ/EL coordinates? Is it a Geoid datum, or an ellipsoid? Thanks, Chris Maness
[email protected] #3466 Hi Chris, The basic astronomical ephemeris engine used by most of XEphem uses the ellipsoid, but the satellite propagator uses the Geoid datum. No explicit attempt is made to reconcile the two where they meet. Elwood
Chris Maness All Messages By This Member #3468 Yes because I was checking the data with the transit by spirit leveling. And the Geoid would be best for that. However it was within a minute accuracy anyhow.? I'm not completely sure of the azimuth but I imagine the vertical would be more sensitive to deflection anyhow. Chris? toggle quoted message Show quoted text On Aug 27, 2015, at 9:12 AM, ecdowney@... [xephem] <xephem@...> wrote: Hi Chris, The basic astronomical ephemeris engine used by most of XEphem uses the ellipsoid, but the satellite propagator uses the Geoid datum. No explicit attempt is made to reconcile the two where they meet. Elwood

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