Velocities on J2000 taken from JPL: https://wgc.jpl.nasa.gov:8443/webgeocalc/#StateVector Masses and radi taken from a combination of JPL and Wikipedia.

Controls (press `?` to open/close this help page)

Zoom

UP ARROW to zoom in
DOWN ARROW to zoom out

Move around

Click+drag to rotate
R to look at the next body (ordered by mass)
F to look at the previous body (ordered by mass)
SHIFT+Q to increase rotation speed when click+dragging
SHIFT+A to decrease rotation speed when click+dragging
CTRL to set view to top down looking down on the ecliptic
SHIFT+CTRL to set view to looking along the ecliptic
SHIFT+Z to set view to looking top down, axis aligning x & y rotation
Z to zoom out to looking top down, axis aligning x & y rotation, and setting size of bodies to true scale

Change preset

P to go to next preset
SHIFT+P to go to previous preset

Time control

SHIFT+R to reset to back to Jan 1st, 2000 (fast, and good to do if things get off)
W to increase step size
S to decrease step size
LEFT Arrow toggle reverse time
W+UP ARROW to increase steps per frame
W+DOWN ARROW to decrease steps per frame
W+LEFT ARROW to set 1 step per frame
W+RIGHT ARROW to set 100 steps per frame
SPACE to set step size to ~real time
SHIFT+SPACE to set step size to 1 hour per frame
N to simulate up to today's date (may take a while)

View of bodies

Q to increase size of bodies exponentially by radius
A to decrease size of bodies exponentially by radius
E to increase minimum size of bodies
D to decrease minimum size of bodies
SHIFT+E to increase minimum size of bodies 10x
SHIFT+D to decrease minimum size of bodies 10x
BACKSPACE to set size of bodies to true scale
SHIFT+BACKSPACE to set size of bodies to exaggerated scale

Toggle Hide

SHIFT+N to toggle hide body names
H to hide current selected body
SHIFT+H to hide toggle hide all bodies except currently selected body
` to hide stats

Lock with sun

1 to toggle visual lock with sun

Trails

T to toggle trails
B to toggle relative to selected body vs relative to Sun
SHIFT+T to toggle dotted trails
T+UP ARROW increase trails dot rate
T+DOWN ARROW decrease trails dot rate
T+LEFT ARROW set trails dot rate to 1/frame
T+RIGHT ARROW set trails dot rate to 10/frame
SHIFT+T+UP ARROW increase trails stroke width
SHIFT+T+DOWN ARROW decrease trails stroke width
O increase points per trail
L decrease points per trail

Console commands

You can use these commands by going into the console (F12 on Chrome, may vary by browser)

getNextApproach(bodyA,bodyB,initialStepSize,precision)

This function will simulate up to the next point in which to bodies reach their closest part of a flyby. The bodys can be grabbed from the nbody object where they key for a body is its name.

initialStepSize is the amount of time in seconds that the steps are when simulating, and then it will binary search its way precision times to get closer to the moment of closest approach. Both initialStepSize and precision are optional, the default step size is 360 (6 minutes), and default precision is 5.

One application for this would be simulating up to the next potential Venus transit:

//getNextApproach(bodya,bodyb,precision*);
getNextApproach(nbody.Earth,nbody.Venus);

Using a body that's not part of the currently selected preset will not work, although it will still work if one or both of the bodies are hidden.

goToDate(date,initialStepSize,precision)

Similar to getNextApproach() but instead of looking for an approach, it targets a specific date, and for precision, it resets back to J2000 before simulating.

date is the date in milliseconds from 1970, initialStepSize and precision work the same as in getNextApproach()

One application for this would be going to the date of an interesting event, like the 2004 Venus transit:

goToDate(new Date("June 8, 2004").getTime())

Controls (press ? to open/close this help page)