mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 12:48:40 -05:00
f283ca5c62
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3839 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
42 lines
1.2 KiB
Fortran
42 lines
1.2 KiB
Fortran
SUBROUTINE COORD(A0,B0,AP,BP,A1,B1,A2,B2)
|
|
|
|
! Examples:
|
|
! 1. From ha,dec to az,el:
|
|
! call coord(pi,pio2-lat,0.,lat,ha,dec,az,el)
|
|
! 2. From az,el to ha,dec:
|
|
! call coord(pi,pio2-lat,0.,lat,az,el,ha,dec)
|
|
! 3. From ra,dec to l,b
|
|
! call coord(4.635594495,-0.504691042,3.355395488,0.478220215,
|
|
! ra,dec,l,b)
|
|
! 4. From l,b to ra,dec
|
|
! call coord(1.705981071d0,-1.050357016d0,2.146800277d0,
|
|
! 0.478220215d0,l,b,ra,dec)
|
|
! 5. From ra,dec to ecliptic latitude (eb) and longitude (el):
|
|
! call coord(0.d0,0.d0,-pio2,pio2-23.443*pi/180,ra,dec,el,eb)
|
|
! 6. From ecliptic latitude (eb) and longitude (el) to ra,dec:
|
|
! call coord(0.d0,0.d0,-pio2,pio2-23.443*pi/180,el,eb,ra,dec)
|
|
|
|
SB0=sin(B0)
|
|
CB0=cos(B0)
|
|
SBP=sin(BP)
|
|
CBP=cos(BP)
|
|
SB1=sin(B1)
|
|
CB1=cos(B1)
|
|
SB2=SBP*SB1 + CBP*CB1*cos(AP-A1)
|
|
CB2=SQRT(1.e0-SB2**2)
|
|
B2=atan(SB2/CB2)
|
|
SAA=sin(AP-A1)*CB1/CB2
|
|
CAA=(SB1-SB2*SBP)/(CB2*CBP)
|
|
CBB=SB0/CBP
|
|
SBB=sin(AP-A0)*CB0
|
|
SA2=SAA*CBB-CAA*SBB
|
|
CA2=CAA*CBB+SAA*SBB
|
|
TA2O2=0.0 !Shut up compiler warnings. -db
|
|
IF(CA2.LE.0.e0) TA2O2=(1.e0-CA2)/SA2
|
|
IF(CA2.GT.0.e0) TA2O2=SA2/(1.e0+CA2)
|
|
A2=2.e0*atan(TA2O2)
|
|
IF(A2.LT.0.e0) A2=A2+6.2831853
|
|
|
|
RETURN
|
|
END SUBROUTINE COORD
|