mirror of https://github.com/saitohirga/WSJT-X.git
73 lines
2.3 KiB
Fortran
73 lines
2.3 KiB
Fortran
subroutine MoonDop(nyear,month,nday,uth4,lon4,lat4,RAMoon4,DecMoon4, &
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LST4,HA4,AzMoon4,ElMoon4,vr4,dist4)
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implicit real*8 (a-h,o-z)
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real*4 uth4 !UT in hours
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real*4 lon4 !West longitude, degrees
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real*4 lat4 !Latitude, degrees
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real*4 RAMoon4 !Topocentric RA of moon, hours
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real*4 DecMoon4 !Topocentric Dec of Moon, degrees
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real*4 LST4 !Locat sidereal time, hours
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real*4 HA4 !Local Hour angle, degrees
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real*4 AzMoon4 !Topocentric Azimuth of moon, degrees
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real*4 ElMoon4 !Topocentric Elevation of moon, degrees
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real*4 vr4 !Radial velocity of moon wrt obs, km/s
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real*4 dist4 !Echo time, seconds
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real*8 LST
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real*8 RME(6) !Vector from Earth center to Moon
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real*8 RAE(6) !Vector from Earth center to Obs
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real*8 RMA(6) !Vector from Obs to Moon
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real*8 rme0(6)
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logical km
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data rad/57.2957795130823d0/,twopi/6.28310530717959d0/
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km=.true.
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dlat=lat4/rad
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dlong1=lon4/rad
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elev1=200.d0
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call geocentric(dlat,elev1,dlat1,erad1)
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dt=100.d0 !For numerical derivative, in seconds
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UT=uth4
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! NB: geodetic latitude used here, but geocentric latitude used when
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! determining Earth-rotation contribution to Doppler.
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call moon2(nyear,month,nDay,UT-dt/3600.d0,dlong1*rad,dlat*rad, &
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RA,Dec,topRA,topDec,LST,HA,Az0,El0,dist)
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call toxyz(RA/rad,Dec/rad,dist,rme0) !Convert to rectangular coords
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call moon2(nyear,month,nDay,UT,dlong1*rad,dlat*rad, &
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RA,Dec,topRA,topDec,LST,HA,Az,El,dist)
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call toxyz(RA/rad,Dec/rad,dist,rme) !Convert to rectangular coords
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phi=LST*twopi/24.d0
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call toxyz(phi,dlat1,erad1,rae) !Gencentric numbers used here!
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radps=twopi/(86400.d0/1.002737909d0)
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rae(4)=-rae(2)*radps !Vel of Obs wrt Earth center
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rae(5)=rae(1)*radps
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rae(6)=0.d0
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do i=1,3
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rme(i+3)=(rme(i)-rme0(i))/dt
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rma(i)=rme(i)-rae(i)
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rma(i+3)=rme(i+3)-rae(i+3)
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enddo
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call fromxyz(rma,alpha1,delta1,dtopo0) !Get topocentric coords
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vr=dot(rma(4),rma)/dtopo0
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RAMoon4=topRA
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DecMoon4=topDec
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LST4=LST
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HA4=HA
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AzMoon4=Az
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ElMoon4=El
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vr4=vr
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dist4=dist
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return
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end subroutine MoonDop
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