Launch Window Planner
for Kerbal Space Program
Kerbin Time (6h days, 426d years)
Earth Time (24h days, 365d years)
No insertion burn (e.g. aerocapture or fly-by)
Mid-course plane change
Show advanced settings...
Time of flight
Select the celestial body you will be departing from.
Enter the altitude of your parking orbit around that body. This is assumed to be a circular, equatorial orbit.
Select the celestial body you wish to travel to.
Enter the altitude of the orbit you wish to establish around your destination body. You may check the "No insertion burn" checkbox instead if you intend to perform a fly-by or aerobraking maneuver.
Enter the earliest departure date to include in the plot. Generally this should be your current game time, which you can find in the tracking station in the game.
Click the "Plot it!" button. After a few seconds a plot will appear showing how much Δv is required to reach your destination for different departure dates and times of flight. Click on any point on this plot to see full details of the selected transfer.
Delta-v transfer plot
Selected transfer details
Time of flight
Plane change time
Angle to intercept
Plane change angle
Plane change Δv
Interactive illustrated interplanetary guide and calculator
which inspired me to create this tool as a web page.
Robert Braeunig's excellent
Rocket and Space Technology
which provided most of the math powering these calculations.
And of course
Kerbal Space Program
for motivating me to finally learn orbital mechanics.
New Orbital Body
Longitude of ascending node
Argument of periapsis
Mean anomaly at epoch
Time of periapsis passage