ASTRONOMICAL!
'(<a href="http://www.j-archive.com/media/2010-07-14_DJ_19.wmv">Sarah of the Clue Crew shows an astronomical animation on the monitor.</a>)  The perigee is the point of the Moon's orbit at which it's nearest to the Earth; similarly, this term is the point at which the orbiting object is closest to the Sun'
the perihelion