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42 lines
1.2 KiB
Fortran
42 lines
1.2 KiB
Fortran
real function dpol(mygrid,hisgrid)
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! Compute spatial polartzation offset in degrees for the present
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! time, between two specified grid locators.
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character*6 MyGrid,HisGrid
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real lat,lon,LST
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character cdate*8,ctime2*10,czone*5,fnamedate*6
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integer it(8)
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data rad/57.2957795/
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call date_and_time(cdate,ctime2,czone,it)
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nyear=it(1)
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month=it(2)
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nday=it(3)
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nh=it(5)-it(4)/60
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nm=it(6)
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ns=it(7)
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uth=nh + nm/60.0 + ns/3600.0
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call grid2deg(MyGrid,lon,lat)
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call MoonDop(nyear,month,nday,uth,-lon,lat,RAMoon,DecMoon, &
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LST,HA,AzMoon,ElMoon,vr,dist)
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xx=sin(lat/rad)*cos(ElMoon/rad) - cos(lat/rad)* &
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cos(AzMoon/rad)*sin(ElMoon/rad)
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yy=cos(lat/rad)*sin(AzMoon/rad)
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poloffset1=rad*atan2(yy,xx)
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call grid2deg(hisGrid,lon,lat)
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call MoonDop(nyear,month,nday,uth,-lon,lat,RAMoon,DecMoon, &
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LST,HA,AzMoon,ElMoon,vr,dist)
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xx=sin(lat/rad)*cos(ElMoon/rad) - cos(lat/rad)* &
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cos(AzMoon/rad)*sin(ElMoon/rad)
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yy=cos(lat/rad)*sin(AzMoon/rad)
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poloffset2=rad*atan2(yy,xx)
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dpol=mod(poloffset2-poloffset1+720.0,180.0)
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if(dpol.gt.90.0) dpol=dpol-180.0
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return
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end function dpol
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