package calculator

// WGS84 ellipsoid constants
const (
	EarthRadius = 6378137.0         // 地球半径，单位米
	a           = 6378137.0         // semi-major axis in meters
	f           = 1 / 298.257223563 // flattening
	b           = a * (1 - f)       // 短半轴
	e2          = 2*f - f*f         // square of eccentricity
	J2000Epoch  = 2451545.0         // Julian date of J2000 epoch
)