How to go to planets/moons which are on a lower orbit around the sun/planet?

[EvilotionCR2]

How to go to planets/moons which are on a lower orbit around the sun/planet? Ive once gone to Gilly, but that was just trial and error, so how should I go to, uhh, Moho for example? I mean the simplest and most efficient path. I know that I should burn retrograde, but when you are on a normal orbit, and you dont have ginormous TWR, its impossible to do it without falling to Kerbin.

[Orionkermin]

On the most basic level you need to burn retrograde relative to kerbin's orbit around the sun. This means you burn prograde in your orbit at the point that your ejection angle leaves Kerbin on its retrograde. Hope that made any sense ^^;

[Xavven]

On the most basic level you need to burn retrograde relative to kerbin's orbit around the sun. This means you burn prograde in your orbit at the point that your ejection angle leaves Kerbin on its retrograde. Hope that made any sense ^^;

Orian has it right. To see how your ejection angle affects your trajectory around the sun, create a maneuver node in your orbit around Kerbin and drag the prograde marker until the delta-v readout says about 1000 m/s.

Zoom out and look at what your orbit around the sun will be.

Now zoom back in and move your maneuver node somewhere else around Kerbin (say, 90 degrees ahead) and look at what happens.

The bottom line is that if you burn prograde and you leave Kerbin in the same direction it's travelling around the sun, you'll be on your way to intersecting Duna's orbit. If you burn progade and you leave Kerbin in the opposite direction, you'll be on your way to Eve. Hope that helps.

[Claw]

... I know that I should burn retrograde, but when you are on a normal orbit, and you dont have ginormous TWR, its impossible to do it without falling to Kerbin.

Yes, like posted above. You will burn toward your prograde marker NOT toward the retrograde marker. But do your burn when your craft is between Kerbin and the Sun. (Daylight side.)

[Nedal]

Yep, burn Prograde during the day to eject to a lower kerbol orbit. Burn Prograde at night to eject to a higher kerbol orbit.

Another note regarding efficiency. When ejecting for a lower orbit, you want your new kerbol apoaps to be right on kerbins orbital line. Or your new periaps to be on kerbins kerbol orbit when ejecting to a higher orbit.

You adjust for this by burning at different times for different distances. For instance flying to moho, you would burn closer to noon, than you would for burning to eve, as burning to moho requires more deltaV which would straighten out your ejection path.

Play around with it for a bit, and you should see what I mean.

[Superfluous J]

And PreciseNode helps a lot in this regard, as you can easily change the time of the burn +/- a multiple of seconds while zoomed out far enough to see the whole Sunar System map.