perigee

As nouns the difference between perilune and perigee

is that perilune is perilune while perigee is perigee (point in the orbit of any object).

As a noun perigee

is perigee (point in the orbit of any object).

As an adjective undefined is

lacking a definition or value.

As nouns the difference between perigee and periapse

is that perigee is perigee (point in the orbit of any object) while periapse is (astronomy) a periapsis.

In astronomy terms the difference between perigee and aphelion

is that perigee is the point, in an orbit about the Earth, that is closest to the Earth: the periapsis of an Earth orbiter while aphelion is the point in the elliptical orbit of a planet, comet, etc., where it is farthest from the sun.

In astronomy terms the difference between opposition and perigee

is that opposition is the apparent relative position of two celestial bodies when one is at an angle of 180 degrees from the other as seen from the Earth while perigee is the point, in an orbit about the Earth, that is closest to the Earth: the periapsis of an Earth orbiter.

As nouns the difference between opposition and perigee

is that opposition is the action of opposing or of being in conflict while perigee is the point, in an orbit about the Earth, that is closest to the Earth: the periapsis of an Earth orbiter.

As nouns the difference between pear and perigee

is that pear is an edible fruit produced by the pear tree, similar to an apple but elongated towards the stem while perigee is the point, in an orbit about the Earth, that is closest to the Earth: the periapsis of an Earth orbiter.

As a noun perigee

is perigee (point in the orbit of any object).

As a proper noun moon is

the earth's moon; the sole natural satellite of the earth, represented in astronomy and astrology by.

As nouns the difference between taxonomy and perigee

is that taxonomy is the science or the technique used to make a classification while perigee is perigee (point in the orbit of any object).