How do I use Horizons to get an angle for the planets current location, ignoring inclination

I had thought I used the Longitude of the Ascending Node, but am starting to think that is different for each planet. As it is, when I use that number the planets are all clustered in about a 100 degree arc on one side of the sun.

Thanks!

Submitted December 07, 2016 at 05:04PM by MrAdventur3 http://ift.tt/2gcn6jc