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Perigee

Astronomy  Periastron  Perihelion
04/17/2014

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.


Perigee
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
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Definition: perigee: 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.

Perigee: 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).

perigee -- 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 ...

Perigee. 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.

perigee
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.

perigee
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.

Perigee. 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.

Perigee -- 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 ...

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

Perigees 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 ...

perigee
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.

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

Argument of perigee
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.

perigee 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 perigee 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 perigee. 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 perigee 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 perigee, 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.

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 perigee to perigee 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.

The closest point a satellite comes to Earth is called its perigee. The farthest point is the apogee. For planets, the point in their orbit closest to the sun is perihelion. The farthest point is called aphelion.

Based on the data presented in the Moon's data box, verify the values given for the Moon's perigee (minimum distance from Earth) and apogee (maximum distance from Earth), and estimate the Moon's minimum and maximum angular diameter, ...


PROXIGEE
For an object orbiting the Earth, the proxigee is the closest perigee. The perigee is the point in each elliptical orbit which is closest to the Earth, but the perigee varies a small amount from orbit to orbit.
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This happens when the Moon is near perigee and its angular diameter as seen from Earth is identical to or slightly larger than that of the Sun. A total solar eclipse is the only opportunity to observe the Sun's corona without specialised equipment.

For example, look for perigee and apogee at Earth, perijove and apojove at Jupiter, periselene and apselene or perilune and apolune in lunar orbit, pericrone and apocrone if you're orbiting Saturn, ...

The interval (27.555 days) between two successive perigee passages of the Moon.[H76]
Anomalistic Year
The interval (365.2596 ephemeris days) between two successive perihelion passages of Earth. [H76]
Anomalous Dispersion ...

an interval of time loosely related to one revolution of the moon around the Earth (a 'moonth'). The calendar month derives from the synodic month (full-moon to full-moon) which averages 29.53059 days. The anomalistic month (perigee to ...

Aphelion / Perihelion is an object's orbital point (in distance and time) around a star where the object's distance (on its elliptical orbit) from its parent star is farthest / closest. The terms apogee & perigee are used instead when referring ...

The Playboy Interview Volume II. New York: Wideview/Perigee, 1983. ISBN 0-399-50768-X (hardcover), ISBN 0-399-50769-8 (softcover)
David Sheff, interviewer; G. Barry Golson, editor. The Playboy Interviews with John Lennon ...

Bender (1987), " New test of general relativity: Measurement of de Sitter geodetic precession rate for lunar perigee", Physical Review Letters 58: 1062-1065, DOI 10.1103/PhysRevLett.58.1062 ...

Since the Moon's orbit is not a perfect circle, its distance varies. At its farthest point, known as apogee, it is 252,080 miles (405,686 km) away. At its closest point, known as perigee, it is 225,621 miles (363,104 km) away.

Perigee
Point of closet approach to the earth
Perihelion
Point in earth's orbit around the sun where it is closest to the Sun (winter for us)
Period-Luminosity Diagram ...

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

Astronomy  Periastron  Perihelion
04/17/2014

 
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