how to convert Alex Moon's "Ejection Angle" into Advanced Orbit tab "Ejection"

[fommil]

If I use Alex Moon's calculator, e.g.

http://alexmoon.github.io/ksp/#/Kerbin/100/Duna/100/false/optimal/false/1/1

it will give me an Ejection Angle for my initial burn, e.g. 153° to prograde.

What I would like to do is to be able to add a maneuver with that exact ejection. Unfortunately, the Advanced Orbit tab gives me an Ejection in a seemingly different basis. It will tell me "angle between the craft, the orbited body and the parent" as an angle from [-180, 180] and I can't work out how to convert between Alex Moon's number and this number. It's not a simple case of the zero has moved, it just doesn't seem to make any sense to me at all.

I end up eyeballing it and sliding the maneuver around until my full burn's Ap is maximised. It would be really nice if there was a way to do that with a level of precision instead of having to slide the actual maneuver backwards and forwards. Maybe I'm missing some button or key combo?

As a bonus question: is there any way to see what the actual phase number is between 2 bodies (without mods)? It's not really important because I just trust the Alex Moon numbers, but it'd be nice to get the confirmation and it's useful for sub-system transfers like in Jool when it feels overkill to use a calculator.

Somewhat related thread: https://forum.kerbalspaceprogram.com/index.php?/topic/184668-17-advanced-orbital-info-tab/

 

Edited November 9, 2022 by fommil

[Vanamonde]

I believe the problem you're having arises from the fact that the calculations assume acceleration is instantaneous. They know this is not physically what happens but the math gets MUCH more complex if you try to take the time of the acceleration into account. I use calculators to give me a rough idea but then, yes, place a maneuver node and tug it around until it does what I want. 

[fommil]

14 hours ago, Vanamonde said:

I believe the problem you're having arises from the fact that the calculations assume acceleration is instantaneous

no, that's not it. The numbers are just in a completely different basis. e.g. I have a Kerbin to Jool transfer and Alex Moon's ejection angle is supposed to be "114 to Prograde". Trial and error in the actual maneuver node gives me an Ejection for the Maneuvre node at "-160.5". It's just completely off and I can't find any stable point to use as the reference for how to convert between the two bases.