mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-25 05:38:46 -05:00
18 lines
421 B
Fortran
18 lines
421 B
Fortran
subroutine geocentric(alat,elev,hlt,erad)
|
|
|
|
implicit real*8 (a-h,o-z)
|
|
|
|
! IAU 1976 flattening f, equatorial radius a
|
|
f = 1.d0/298.257d0
|
|
a = 6378140.d0
|
|
c = 1.d0/sqrt(1.d0 + (-2.d0 + f)*f*sin(alat)*sin(alat))
|
|
arcf = (a*c + elev)*cos(alat)
|
|
arsf = (a*(1.d0 - f)*(1.d0 - f)*c + elev)*sin(alat)
|
|
hlt = datan2(arsf,arcf)
|
|
erad = sqrt(arcf*arcf + arsf*arsf)
|
|
erad = 0.001d0*erad
|
|
|
|
return
|
|
end subroutine geocentric
|
|
|