j2000-w84

2024-05-21 11:48:10 +08:00
parent c108f0337b
commit dd23760dbb
6 changed files with 141 additions and 36 deletions
--- a/calculator/const.go
+++ b/calculator/const.go
@@ -0,0 +1,9 @@
+package calculator
+
+// WGS84 ellipsoid constants
+const (
+	a  = 6378137.0         // semi-major axis in meters
+	f  = 1 / 298.257223563 // flattening
+	e2 = 2*f - f*f         // square of eccentricity
+	J2000Epoch = 2451545.0 // Julian date of J2000 epoch
+)