Description

An educational orbital-geometry watchapp for Pebble Time 2. Constellation propagates public CelesTrak GP/TLE element sets with SGP4 to plot modeled GPS, Galileo, GLONASS, and BeiDou positions. It is not a GNSS receiver: it does not receive satellite signals, produce a navigation fix, or estimate real-world positioning accuracy. TLE elements do not include an accuracy estimate.

FOUR VIEWS
• Orbit globe: modeled satellite positions; orbital-plane rings are schematic guides, not fitted to the TLEs.
• Skyplot: modeled azimuth and elevation from the selected center. Bars show elevation only, not signal strength.
• Geometry: DOP derived from modeled directions; singular or insufficient geometry displays N/A. DOP describes geometry, not position accuracy.
• World map: simplified coastlines, selected center, and modeled sub-satellite points; no reception-radius circle.

Phone coordinates are used on-device and are not sent to CelesTrak. Choose phone location or validated manual coordinates. A location failure is shown without a substitute location. TLE age is displayed; fresh elements require internet access. Cached elements can be viewed offline.

Controls: hold UP/DOWN to change panes; click UP/DOWN on the globe to rotate; SELECT toggles catalog-number labels; hold SELECT refreshes. Data: CelesTrak GP/TLE. Source: https://github.com/globe-and-atlas/constellation-watch