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Apparition: An appearance; in astronomy, the period of observation of a returning periodic comet.
Argument of perihelion: Angle along the orbit of a planet or other solar system object as measured from the ascending node (analogous to right ascension and longitude).

Apparition is the appearance or time when a comet is visible such as Halley's Comet.

Apparition. The period or time when an object is visible and well placed for observation.
Appulse. The apparent close approach of two celestial bodies as seen from Earth, such as a star and a planet, or two planets for example.

The period during which a celestial body is visible.
Appleton Layer ...

Let the Apparition Begin
We begin early in the apparition when the apparent diameter of Mars is a tiny 3 or 4 seconds of arc and practice each morning until we have identified all the Martian features we have learned over the years.

apparition Period of time during which it is possible to observe a celestial body that is only visible periodically. The term is usually used to describe a particular appearance of a comet, such as the 1985-86 apparition of Comet halley.

All apparitions of Mercury are not created equal. Because of the tilt of the ecliptic — the path that the planets follow across the sky — the inner planets, Mercury and Venus, are much higher in the sky at some times than others.

Parabolic and hyperbolic orbits (not bound).
Periodic comets Those with short orbit durations Nucleus ...

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The rate of diurnal motion undergoes seasonal variation because of the obliquity of the ecliptic and because of the eccentricity of the Earth's orbit. Additional small variations result from irregularities in the rotation of the Earth on its axis. [S92]
Apparition ...

It can also change from apparition to apparition (for periodic comets). absolute manometer (NASA SP-7, 1965) 1. A gas manometer whose calibration, which is the same for all ideal gases, can be calculated from the measurable physical constants of the instrument.

Pioneer Venus 1, launched in 1978 by NASA to explore the atmosphere and surface of Venus, spent some time observing 1P/Halley in the ultraviolet during the comet's 1986 apparition.

Over the period 1819-1821 the German mathematician and physicist Johann Franz Encke computed orbits for a series of cometary apparitions observed in 1786, 1795, 1805, and 1818, concluded that they were same comet, and successfully predicted its return in 1822.

In 1705, Edmond Halley applied Newton's method to twenty-three cometary apparitions that had occurred between 1337 and 1698.

long-period comets and one-apparition periodic comets receive only a provisional designation -- there is no equivalent of the Roman numeral designation.
upon recovery at a second apparition (or following through aphelion) periodic comets receive a sequential number. E.g., P/Halley is 1P.

Pamela: So, he went through the records and started looking at comet apparitions. Up until the late 1500s, everyone had thought that comets were just atmospheric disturbances, but Tycho Brahe, as we've discussed before, figured out using parallax that comets had to be further away than the moon.

It is now understood that a spectacular supernova explosion - the detonation of a massive star whose remains are now visible as the Crab Nebula- was responsible for the apparition.

Jupiter and Mars, which had a lovely apparition in the western sky at twilight over the past few months, have swung around the Sun to appear in the east-northeastern morning sky about an hour before sunrise. Mars is just 1/2 a degree from the star cluster M35 in Gemini on the 17th.

Throughout recorded history, and quite likely a good deal before it, comets have long been apparitions to frighten humans, to inspire them, and to serve as heavenly messengers of a sort.

The highlight of ISON's apparition will certainly occur in mid-December. The comet will then be visible at both dawn and dusk, a third of the way up from the eastern horizon just before sunrise and low in the west soon after sunset.

is a Sanskrit term meaning "sight" , vision, apparition, or glimpse. It is most commonly used for "visions of the divine," i.e. of a god or a very holy person or artifact....
(holy view) of the deities as they pass. This festival is known as Ratha Yatra.

One of the more spectacular changes recorded for Halley during an apparition was the detachment event that occurred on April 12, 1986. This 3 minute exposure was taken using the Michigan Schmidt telescope at Cerro Tololo Interamerican Observatory.

4. Try to spot Mercury in morning or evening twilight. (Hint: As seen from the Northern Hemisphere, the best evening apparitions of the planet take place in the spring, and the best morning apparitions take place in the fall.) ...

Low on their horizon, in spring skies, there appeared the apparition of a great ship. This ship sailed ever westward skimming along the southern horizon. The ancient Greeks said it was Argo Navis, the ship sailed by Jason and his Argonauts in search of the Golden Fleece.

Being a New Yorker, I've become quite used to these apparitions.
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The apparent motions of the Sun and planets were superimposed on this sphere, with the Sun's daily and yearly motions, and the moon's monthly apparitions having special importance.

Good Mercury watching begins this Saturday evening, June 3, when a slender crescent Moon and the elusive planet appear together for stargazers just after sunset. Mercury's apparition as an evening star will continue through mid-June.

It's possible to see Mercury lurking close to the horizon with the eyes alone, but binoculars help out immeasurably to highlight its waning luster in the ever-brightening twilight. Keep in mind that the apparition disappears as quickly as an early morning dream.

See also: See also: Planet, Astro, Sun, Earth, Sky

Astronomy  Apparent Visual Magnitude  Apse

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