[amsat-bb] Re: G3RUH plan 13 algorithm help

David Johnson dave at thejohnsonsonline.net
Fri Jan 24 01:38:37 PST 2014


Right Ascention of the Ascending node.

The point in the orbit at which it crosses the equator going northbound.

Here 's a good example:



Dave, G4DPZ

On 24/01/14 08:59, Lizeth Norman wrote:
> *HI all,Found this at this
> page:http://www.amsat.org/amsat/articles/g3ruh/111.html
> <http://www.amsat.org/amsat/articles/g3ruh/111.html>Orbit Plane:* Fixed
> (almost) with respect to the stars, in orientation defined by argument of
> perigee, inclination and RAAN.
> Origin: Earth's centre.
> X: Directed towards perigee
> Y: 90 degrees from perigee round the orbit in direction of satellite's
> motion
> Z: Perpendicular to orbit plane
> I think I understand most of the math in the algorithm. In the above
> context, what does RAAN mean?
> Sorry for being obtuse!
> Norm n3ykf
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