mckero
79215e7623
The UTC alignment landed with tests covering the normal cases; these cover the ones that would have made it wrong quietly. Midnight arithmetic is exercised at exactly midnight, a second either side, every leap-day combination around 2028-02-29, both year boundaries, and the first of all twelve months in a leap and a non-leap year. Since the code steps back a day by subtracting 86400 rather than using Calendar arithmetic, those dates are where a naive step would drift. Every slot edge across all three days is probed at the boundary and one second either side, asserting each instant occupies exactly one cell and that the cell's day matches the report's UTC date - `until` versus `..` on the slot range is a one-character mistake that would double-count edge reports. Also pinned: the shared Calendar is not re-read after the labels loop (it points at the oldest day by then), repeated calls are idempotent, duplicate catalogue names produce duplicate rows carrying the same report, reports for names absent from the catalogue are dropped, and the build stays linear in reports rather than quadratic. Adds a comment recording why reusing that Calendar is safe: each pass assigns timeInMillis outright instead of adjusting fields. 235 tests pass.
Look4Sat: Satellite tracker
Radio satellite tracker and pass predictor for Android, inspired by Gpredict
Track satellite passes with ease!
Thanks to Celestrak and SatNOGS you have access to over 9000 active satellites.
You can search the entire database by NORAD Catalog Number or the satellite's name.
Orbital positions and passes are calculated relative to your location.
To get reliable data make sure to set the station position via the app Settings.
The application is built using Kotlin, Coroutines, Jetpack Compose and Navigation.
It is now and always will be completely ad-free and open-source.
Main features:
- Predicting satellite positions and passes for up to 10 days
- Showing the list of currently active and upcoming satellite passes
- Showing the active pass progress, polar trajectory and transceivers info
- Showing the satellite positional data, footprint and ground track on the map
- Custom TLE satellite data import is available via Three Line Element .txt files
- Offline first: calculations are made offline. Weekly TLE data update is recommended.
License
The Look4Sat application code is licensed under the GNU General Public License v3.0.
The CW decoder in feature/cw bundles the DeepCW
neural decoding model, licensed under the GNU Affero General Public License v3.0 only
(AGPL-3.0-only). Because the combined work incorporates an AGPL-3.0 component, the
combined work is distributed under the
GNU Affero General Public License v3.0 — GPL-3.0 Section 13 permits the
combination, and AGPL-3.0 Section 13 applies to the combined work as a whole.
Model provenance and attribution are documented in
feature/cw/licenses/NOTICE.md; the original GPL-3.0
text is preserved at feature/cw/licenses/Look4Sat-GPL-3.0.txt. The CW model runs
locally on-device and does not provide services over a network.