I have an object (A) at some altitude above the Earth ellipsoid, and a point (B) on the surface of the Earth.(adsbygoogle = window.adsbygoogle || []).push({});

Since you're not confined to the surface of the earth as you travel from A (at altitude), to B, I'm getting confused.

If I were to create a (Cartesian) vector pointing from object A in the air, to point B on the ground,

would a rhumb line, or a great circle be a more accurate representation of the vector if I were to put the discretized values of the vector in terms LLA (latitude, longitude, and altitude)?

Maybe a better way to ask is: What is the LLA projection of the Cartesian vector pointing from A to B? And would that projection be better represented as a rhumb line, a great circle, or some other calculation?

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Earth Geodesics - Rhumb Line vs Great Circle

**Physics Forums | Science Articles, Homework Help, Discussion**