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Apollo Free-Return Trajectory 3D Explorer vs alternatives
The Apollo Free-Return Trajectory 3D Explorer shows free-return vs hybrid lunar paths in the browser with published NASA figures - textbooks win for full burn timelines; planetarium apps win for sky-aligned ephemerides.
| Option | Strength | Access | Trade-off |
|---|---|---|---|
| Apollo Free-Return 3D (this page) | Free-return vs hybrid toggle + phase scrub + NASA table | Free, in browser | Compressed scale; not a burn solver |
| Apollo mission report / NTRS paper | Full burn times and navigation detail | Free, research-oriented | No interactive 3D path |
| Desktop planetarium / mission tool | Sky-aligned timing and ephemerides | App / install | Heavier setup; not focused on free-return teaching |
Key published figures
| Figure | Value |
|---|---|
| Early Apollo free-return PC | ~110 km (~60 nmi) |
| Apollo 13 restored free-return PC | ~250 km (~135 nmi) |
| Furthest from Earth (Apollo 13 PC) | 400,171 km |
| Pre-restore hybrid Earth perigee | ~2,500 nmi |
| DPS-1 restore burn | 34.23 s at GET 61:29:43 |
Start with the step-by-step guide or when to use. Open the Apollo Free-Return Trajectory 3D Explorer.
freetoolonline.com editorial team
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