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Re: spherical trigonometry question

  • To: mathgroup at
  • Subject: [mg32032] Re: spherical trigonometry question
  • From: Hans Michel <hansjm at>
  • Date: Wed, 19 Dec 2001 04:29:16 -0500 (EST)
  • References: <9v77nr$s5s$>
  • Sender: owner-wri-mathgroup at

Answer to part one
Straight from the help files.

<< Miscellaneous`Geodesy`

FromLat = 0;
FromLong = 0;

ToLat = 45;
ToLong = 45;

Here is the distance between the points using a spherical model
SphericalDistance[{FromLat,FromLong},{ToLat,ToLong}] //N

Here is the distance between the same points using a spheroidal model.
SpheroidalDistance[{FromLat,FromLong},{ToLat,ToLong}] //N

Please also see
<< Miscellaneous`CityData`

The CityData is based on the Geodesy.

There is a database in use there, you could add Airport data to it or you
can make your own notebook modeling the city data .m and when done post 
for others to use.

As for question 2. I don't have an answer yet.

>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<

On 12/12/01, 3:24:11 AM, "R. van Laake" <~raymond at> wrote 
regarding spherical trigonometry question:

> Hello,

> Who can help me with the following two formulae:

> I am in an airplane, my position (Latitude/Longitude) is FromLat / 
> I have to go to an airport positioned ToLat / ToLon.

> 1: What is the distance between FromLat / FromLon and ToLat / ToLon?
> 2: What direction must I take?

> Thanks,

> Raymond van Laake
> raymond at

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