Reference · Satellites: orbital elements in, positions out
MissionPositiontype
Where a craft was at a moment: over the ground (WGS 84), how high, how fast, and which element set the place came from.
Import it
import type { MissionPosition } from "@johnmorrisdotca/chikyu-earth/satellites";Definition
interface MissionPosition {
latitude: number;
longitude: number;
altitudeKm: number;
speedKmS: number;
epochMs: number;
}Members
| Name | Type | Description |
|---|---|---|
latitude | number | Degrees north. |
longitude | number | Degrees east, -180 to 180. |
altitudeKm | number | Height above the WGS 84 ellipsoid, kilometres. |
speedKmS | number | Speed against the stars, kilometres a second. |
epochMs | number | The moment of the element set used, milliseconds since the Unix epoch. |
Examples
import type { MissionPosition } from "@johnmorrisdotca/chikyu-earth/satellites";
const describe = (place: MissionPosition): string => `${place.latitude.toFixed(1)}, ${place.longitude.toFixed(1)}, ${place.altitudeKm.toFixed(0)} km`;
console.log(describe({ latitude: 28.5, longitude: -80.6, altitudeKm: 300, speedKmS: 7.7, epochMs: 0 }));28.5, -80.6, 300 kmWhat it prints (run when this page was built)