The term 'opposite of perigee' is referring to the APOGEE, which is the point in an orbit that is farthest from the center of the body being orbited. APOGEE is a six-letter word and is the answer to the crossword puzzle. Perigee is the point in an orbit that is closest to the center of the body being orbited. The two points are opposite of each other and are important terms in astronomy and space exploration.