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In this sunglint package, some internal function names have been changed
to avoid double definition.  

the following functions are taken from GEOLOCATE.a and we have changed their names.
gha2000()      ->          gha2000SG()
sun2000()      ->          sun2000SG()
jd()           ->          jdSG()
ephparms()     ->          ephparmsSG()
nutate()       ->          nutateSG()

date2jday()    ->          date2jdaySG()
