import numpy as np

PI = np.pi

# earth angular velocity
EARTH_ROTATE=7.2921151467e-5



RE_WGS84   = 6378137.0         # earth semimajor axis (WGS84) (m) 
BE_WGS84   = 6356752.3141

E2_WGS84   = 0.00669437999013
E2_WGS84_2 = 0.006739496742227
FR_WGS84   = 1 / 298.257222101   # earth flat rate (WGS84)
GM         = 3.986005e14

GAMA_A     = 9.7803267715 # gravity at equatorial
GAMA_B     = 9.8321863685 # gravity at pole point

D2R=PI/180
R2D=180/PI

