33 lines
674 B
Plaintext
33 lines
674 B
Plaintext
subroutine grayline(nyear,month,nday,uth,mygrid,nduration,isun)
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character*6 mygrid
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real LST
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real lat,lon
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call grid2deg(MyGrid,elon,lat)
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lon=-elon
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uth0=uth-0.5*nduration/60.0
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uth1=uth+0.5*nduration/60.0
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call sun(nyear,month,nday,uth0,lon,lat,RASun,DecSun,LST, &
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AzSun,ElSun0,mjd,day)
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call sun(nyear,month,nday,uth1,lon,lat,RASun,DecSun,LST, &
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AzSun,ElSun1,mjd,day)
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elchk=-0.8333
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isun=-1
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if(elsun0.lt.elchk .and. elsun1.ge.elchk) then
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isun=0
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else if(elsun0.gt.elchk .and. elsun1.le.elchk) then
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isun=2
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else if(elsun1.gt.elchk) then
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isun=1
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else
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isun=3
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endif
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return
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end subroutine grayline
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