Perigee
A perigee was the point in any orbit nearest to the body being orbited. The opposite of perigee was the apogee. 

In 2267, Captain James T. Kirk ordered Hikaru Sulu to increase the 's orbit of Gamma Hydra IV to a 20,000 mile perigee, and under the influence of a virus that caused rapid aging repeated the same order a few minutes later. ()

In 2366, the crew of the  attempted to correct the decaying orbit of Bre'el IV's moon when it reached its perigee. ()

External link

Physics
Astronomy