ISS Observation Planner
Plan sunlit ISS observation candidates from NASA trajectory data. Check local directions, horizon limits and optional cloud estimates, then print an observation card.
How we build a check
This workbench processes supported inputs locally. We test calculations, file structure and generated artifacts using independent readers or known fixtures where available. The example runs the same processing path as a supplied input; it does not stand in for checking your own result.
Editorial responsibility
KitForma maintains this tool and its guides. The source notes on the tool page link to the supporting documentation. We do not claim affiliation with the referenced hardware manufacturers or platforms. Review date: 2026-10-19.
Limits and updates
ISS only · NASA OEM 2.0 EME2000/UTC single segment ≤4MiB/10,000vectors · 1–72hours within usable dates · ten-second midpoint resolution · no visibility guarantee or extrapolation. If a specification changes or a result appears incorrect, send the relevant source URL and a non-sensitive reproduction to kitforma@outlook.com.
Open-source components
The tools use self-hosted open-source components appropriate to each format, including PDF.js, pdf-lib, fflate, SheetJS, MediaInfo by MediaArea.net SARL and others. Component versions and licenses. MediaInfo license · fflate license.