SDK Question Calculating plane change nodes

[Mogeley]

I'm having trouble calculating the intersection nodes for a plane change in a format that are useful to me.

Currently I can calculate the nodes in Lat/Long format (using initial and final Inclination and LAN).

The part I'm having trouble with is converting the nodes to angles in reference to the True Anomaly. From there I could calculate everything else I need.

I'm using this as a help for calculating the off angle for the and the node locations (starting in section 4.69): http://www.braeunig.us/space/orbmech.htm

Any ideas would be greatly appreciated!

 

[tblaxland]

In section 4.71, the vector c = {c1,c2,c3} is the vector pointing to the ascending node. The descending node is -c. The node position relative to the true anomaly is just the angle between the eccentricity vector and the node vector. You can calculate the true anomaly by [ame="http://en.wikipedia.org/wiki/Eccentricity_vector"]calculating the eccentricity vector[/ame] and normalising it, normalise the node vector, and use the dot product identity to calculate the angle between the two vectors.