How to get Equtorial Encounter With any Body in KSP

[I likeOxidizerrfuel]

Recently I've been going to Mun and never getting Equtorial Encounters with it. What do I need to do to make My encounters Equtorial?

[Superfluous J]

For Mun, you must start with an equatorial orbit of Kerbin. To get an equatorial orbit of Kerbin, launch EXACTLY east from the launch pad (doing an otherwise decent gravity turn) and once in orbit, target Mun and see how you didn't actually launch EXACTLY east because your An and Dn will not be 0. Don't worry, they never are. Hopefully, however, they are close to 0. Say, less than 2 degrees.

To make them be 0, burn north at your Dn or South at your An. Do it slowly, and only until they are actually 0. When they flip, they're probably there. Use maneuver nodes for more precision and less headache.

Then, when you eject to Mun, do it with ONLY prograde thrust. Depending on how close to 0 your An and Dn actually are, your Mun encounter will be more or less perfectly equatorial.

NOTE: This isn't particularly efficient but it's not particularly INefficient if you start with a good launch. If your launch is like 10 degrees tilted to Mun or something, though, that burn at An or Dn is going to start getting expensive.

NOTE 2: This only works for Mun. You basically can't just nail an equatorial encounter with any other body without a ton of math and precision that is - frankly - not worth it unless you want to challenge yourself to do so. See this for a challenge I made with Minmus and some of the difficulties doing something that sounds like it'd be simple.

NOTE 3: It's almost always easier to just fix your orbit once you're at the world you're orbiting, and it's also almost always easier to just give up the ghost and not worry TOO much how equatorial your orbits are.

Edited September 10, 2018 by 5thHorseman

[Snark]

Moving to Gameplay Questions.

[The Aziz]

2^

That being said, if you have time, you can always set yourself in very eccentric (or simpler: very high) orbit once you get an encounter, and change inclination to 0 at the highest AN/DN.

Edited September 11, 2018 by The Aziz

[Vanamonde]

Given differences in inclination to most worlds and the accuracy needed over long distances, Mun is the only place where you might be able to do this consistently. So I'd suggest not bothering to get it precisely right in transit and just assuming that you're going to need to do some adjustment after arrival. 

[Mahnarch]

I always fix mine enroute, close to SOI change or shortly afterwards.

The further out you are, the cheaper it'll be.