Wind-adjusted fuel burn ±20% + refuel-for-flight buys 150% margin (ISS-070, ISS-071, v0.36.0)

2026-09-21 08:47:42 +00:00
parent 6d8e1ad35e
commit 5030fcd8b4
16 changed files with 309 additions and 81 deletions
@@ -1,5 +1,18 @@
 const EARTH_RADIUS_KM = 6371;

+// Initial great-circle bearing from point 1 to point 2 (v0.36.0), degrees true [0, 360).
+export function initialBearingDeg(lat1: number, lon1: number, lat2: number, lon2: number): number {
+  const toRad = (d: number) => (d * Math.PI) / 180;
+  const phi1 = toRad(lat1);
+  const phi2 = toRad(lat2);
+  const dLon = toRad(lon2 - lon1);
+  const theta = Math.atan2(
+    Math.sin(dLon) * Math.cos(phi2),
+    Math.cos(phi1) * Math.sin(phi2) - Math.sin(phi1) * Math.cos(phi2) * Math.cos(dLon),
+  );
+  return (theta * 180 / Math.PI + 360) % 360;
+}
+
 // Great-circle distance between two WGS84 points (haversine), in km.
 export function haversineKm(lat1: number, lon1: number, lat2: number, lon2: number): number {
  const toRad = (d: number) => (d * Math.PI) / 180;