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How to explore Orbital Velocity 3D Explorer

Open the Orbital Velocity 3D Explorer, watch speed change along the ellipse, and read Vis-viva km/s with periapsis and apoapsis markers in the facts panel.

  1. Open https://freetoolonline.com/space-3d/orbital-velocity.html and wait for the star, elliptical path, and orbiting body.
  2. Read the facts panel: Vis-viva v = sqrt(GM(2/r - 1/a)) and live km/s readout.
  3. Press Mercury for ~47.36 km/s mean speed or Earth for ~29.78 km/s or Neptune for ~5.43 km/s.
  4. Watch the yellow velocity arrow - fastest near the green periapsis marker, slowest near red apoapsis.
  5. Drag the eccentricity slider to deepen the ellipse and see a wider periapsis/apoapsis speed contrast.

Next: the when guide or vs alternatives. Open the Orbital Velocity 3D Explorer.

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