Exposure by sunlight

Direct light only; a sundial (image and a text file) can be also produced.

Longitude: (western as -)   Latitude:
Extinction in zenith:  cmag  (city air has rather 35 cmag)
Compute illumination of the surface with its normal pointing at: Azimuth from N:   Ang. height:
save settings    name='mydefault' value='True'> use my saved settings

Another option is to use your own command line (ev. name='override' value='True'> overriding all previous data):

(`?' gives help). 

";
 echo system(EscapeShellCmd("/home/jhollan/bin/".$para)) ;
 echo "

"; echo '

This is a result of the programme sundialt (available as a part of a package pas_jh.zip (1.2 MB) -- the needed Pascal units themselves are unzipped within this directory, the whole tree of my programmes within this directory) with a command line: 
' ;
  echo EscapeShellCmd($para) ;
  echo "
" ; ?>