# csete/gpredict

Gpredict satellite tracking application

Repository: https://github.com/csete/gpredict
Canonical: https://ross.abutalabs.com/products/gpredict
Homepage: http://gpredict.oz9aec.net/
Language: C
License: GPL-2.0
License Family: copyleft
Topics: c, satellite, tracking, space, ham-radio, amsat, gtk3, linux, gnss, gps
Last push: 2026-08-16T15:12:21+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 4410, "days_push": 17, "days_rel": 17, "gap_med": 56.0, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1170, forks 295 (observed 2026-08-28T04:03:51.314982+00:00)

## What it is
Gpredict is a real-time satellite tracking and orbit prediction desktop application using SGP4/SDP4 propagation with NORAD TLE data. It displays satellite positions on maps, lists, and polar plots, predicts passes, and controls radios and antenna rotators via Hamlib.

## Use cases
- track satellites in real time from my ground station
- predict upcoming satellite passes over my location
- control my antenna rotator to follow satellites automatically
- doppler-tune my radio for satellite contacts
- visualize satellite positions on a map and polar plot
- track many satellites with multiple ground stations

## When to choose
- you are a ham radio operator or satellite enthusiast needing real-time tracking and pass prediction
- you want automated antenna rotator and radio Doppler control via Hamlib
- you need flexible visualization with maps, tables, and radar views grouped into modules

## When to avoid
- you need a headless or programmatic satellite tracking library rather than a GUI app
- you need interplanetary or deep-space orbit propagation (planned but not implemented)
- you require a mobile or web-based tracking solution

## Facets
- artifact type: application
- maturity: stable
- function: simulation, data-visualization, gui
- domain: astronomy, simulation, cross-platform
- platform: windows, cpp
- tags: satellite-tracking, ham-radio, sgp4, tle, orbit-prediction, doppler-tuning, antenna-rotator, gtk3, amsat, linux, macos, desktop

## Member repositories
- csete/gpredict (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:51.314982+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:28:36.383690+00:00, confidence not recorded.
  - readme: https://github.com/csete/gpredict (fetched 2026-08-28T04:03:51.314982+00:00, sha 3391f27122c1)
  - homepage: http://gpredict.oz9aec.net/ (fetched 2026-08-29T12:34:27.263793+00:00, sha b1abaff28c9f)
  - site_page: https://oz9aec.dk/gpredict/features.php (fetched 2026-08-29T12:34:27.275209+00:00, sha 3168005a7b29)
  - site_page: https://oz9aec.dk/gpredict/index.php (fetched 2026-08-29T12:34:27.273144+00:00, sha 3a33cee8693f)
- Data as of 2026-08-30T08:39:29.467469+00:00.