usage: sunwait [options] [sun|civ|naut|astr] [up|down] [+/-offset] [latitude] [longitude]

latitude/longigude are expressed in floating-point degrees, with [NESW] appended

example: sunwait sun up -0:15:10 38.794433N 77.069450W
This example will wait until 15 minutes and 10 seconds before the sun rises in Alexandria, VA

The offset is expressed as MM, or HH:MM, or HH:MM:SS,
and indicates the additional amount of time to wait after 
(or before, if negative) the specified event.

options: -p prints a summary of relevant times
         -z changes the printout to Universal Coordinated Time (UTC)
         -V prints the version number
         -v increases verbosity

These options are useful mainly when used with the '-p' option
         -y YYYY sets the year to calculate for
         -m MM sets the month to calculate for
         -d DD sets the day-of-month to calculate for

         -h prints this help

