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Perigee

Astronomy  Periastron  Perihelion

Perigee
The Moon moves around the Earth in an elliptical orbit (the orbit has been exaggerated in this diagram). The Moon is at perigee when it is is closest to the Earth.



Related Category: Astronomy: General
(pr´j), point nearest the earth in the orbit of a body about the earth. See apsis.

perigee at HighBeam Research
perigee on Wikipedia
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Definition: : The point in its orbit where an Earth satellite is closest to the Earth. Opposite of apogee.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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Perigee and Apogee. These are the minimum and maximum distances from the Earth of a satellite or other body.
Perihelion and Aphelion are the minimum and maximum distances from the Sun of a planet or other body.

: point in the Moon's orbit when it is nearest to Earth.
Stationary: Object appears motionless in the sky due to the turning point between its direct and retrograde motion.

PERIGEE - The point in a satellite’s or the Moon’s orbit when it is closest to Earth. At this point, the object is moving at its maximum speed (Kepler's Second Law).

-- the point in the orbit of the Moon that is closest to the Earth.
perihelion -- the point in the orbit of the Earth that is closest to the Sun. Currently the Earth reaches perihelion in early January.

Perigee
The point at which a body in orbit around the Earth most closely approaches the Earth. Perigee is sometimes used with reference to the apparent orbit of the Sun around the Earth.
Perihelion ...

. The point where (and when) an object's orbit about the earth in which it is closest to the earth; only applicable to objects orbiting the earth (not to objects orbiting the sun --- a common error).

Perigee The position in a geocentric orbit at which the orbiting object is at its least distance from Earth.
Perihelion The position in a heliocentric orbit at which the orbiting object is at its least distance from the Sun.


The point in its orbit where a satellite or the Moon is nearest the Earth.
perihelion
The point in its orbit where a planet is nearest the Sun.

perigee
The point in the orbit closest to the Earth.
perihelion
The point in its orbit where a planet is closest to the Sun.


The point in its orbit where the Moon is at its closest to the Earth. Opposite of apogee.
perihelion
The point in its orbit where a planet is at its closest to the Sun. Opposite of aphelion.

Perigee
the point in the orbit of the Moon or other satellite at which it is closest to the Earth.
Perihelion
the point in the orbit of a planet or other body where it is closest to the Sun.

. The position of the Moon in its orbit when it is closest to the Earth.
Perihelion. The position of the Earth (or other planet) in its orbit when it is closest to the Sun.

perigee: The orbital point of closest approach to Earth.
perihelion: The orbital point of closest approach to the sun.

-- the point of a satellite's orbit closest to Earth (see perihelion, apogee).
Perihelion -- The point in a planet's orbit when it is closest to the Sun (Helios is Greek for Sun). See aphelion, ...

Perigee:
The point in the orbit of the moon or artificial satellite nearest the earth.
Perihelion:
The point on an orbit nearest the sun.

s and apogees recur on or near the same calendar dates every four years.
A Parting Word ...

Perigee
The point in an objects orbit around the Earth when it is closest to the Earth.
Perihelion ...


the point in a satellite's orbit when it is closest to Eart
perihelion ...

At perigee or apogee, there is NO libration of longitude. Maximum librations are seen about one week AFTER perigee and one week AFTER apogee, each time revealing about 8 degrees of longitude on the Moon's far side.

At , the full Moon is about 14% larger in diameter and 30% brighter than a full Moon at apogee, when it's furthest away. Compared to its average distance, it's 7% larger in diameter and 15% brighter.

Apogee - Perigee Photographic Size Comparison
Aphelion - Perihelion Photographic Size Comparison
Aphelion - Perihelion Dates and Times
v - d - e ...

Argument of
progressing by one revolution in 8.85 years
Satellite of ...

>"Supermoon" perigee: out of the ordinary, but didn't obtain at time of earthquake-more than a week off still.
>"Supermoon" caused Earthquake? No.

perihelion point in the path of a body orbiting the Sun where it is closest to the Sun.

Perigee and Apogee
The largest separation between the Earth and Moon on its orbit is called apogee and the smallest separation is called perigee.

2616 light years penumbra the incomplete part of a shadow surrounding the umbra the innermost point of a terrestrial orbit perihelion the innermost point of a solar orbit planet a celestial body that ...

when referring to objects orbiting the Earth the term perigee is used; the term periapsis is used for orbits around other bodies.

peri A prefix meaning near as in . periapsis The orbital point nearest the center of attraction. See orbit. periastron That point of the orbit of one member of a binary star system at which the stars are nearest to each other.

anomalistic month (NASA SP-7, 1965) The average period of revolution of the moon from perigee to perigee, a period of 27 days 13 hours 18 minutes 33.2 seconds.

After launch on an M-V-3 launch vehicle Nozomi was put into an elliptical geocentric parking orbit with a of 340 km and an apogee of 400,000 km.

This means there's a fairly large difference between the perigee (when the Moon is at the closest point in its orbit) and apogee (when the Moon is at its farthest).

This very high tide occurs when the moon is both unusually close to the Earth (at its closest , called the proxigee) and in the New Moon phase (when the Moon is between the Sun and the Earth).

Usually a satellite's orbit is an ellipse with a perigee altitude and an apogee altitude.

Another requirement is for the Moon to be near (closest to Earth), when it will make the quickest possible getaway from the Sun's vicinity.

On the third revolution the perigee was raised to 230 km to ensure an orbital lifetime of 15 days. On December 6, 45 hours into the mission, Lovell removed his spacesuit to evaluate the shirtsleeve environment.

the anomalistic, or time of revolution from to again, in length 27 d. 13 h. 18 m. 37.4 s.; and the tropical, or time of passing from any point of the ecliptic to the same again, equal to 27 d. 7 h. 43 m. 4.7 s.

See also: See also: Orbit, Earth, Astro, Moon, Sun

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