Adding True Node to the Planet Listing

Hi Isabel, I am using you plugin Planetary Position and it works perfecly, thanks! I would like to add the True Node to the planet listing. I added the line working on the sorce files of the plugin bt of course it does not do the calculations and that is beyond my knowledge.
I wonder if you can help.
Cheers!
giac

https://wordpress.org/plugins/current-planetary-positions/