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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. 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.

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

~s, Jesus, Mary
Crosses of Light
Crystal Tears
Healing Water and Wells
Hindu Drinking Milk Miracle
UFO Sightings in History
Weeping Statues, Blood, Oil, Water ...

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]
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It can also change from ~ to ~ (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 ~.

Over the period 1819-1821 the German mathematician and physicist Johann Franz Encke computed orbits for a series of cometary ~s 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 ~s that had occurred between 1337 and 1698.

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

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 ~.

Jupiter and Mars, which had a lovely ~ 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.

The highlight of ISON's ~ 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, ~, 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.

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

Low on their horizon, in spring skies, there appeared the ~ 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 ~s.
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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 ~s 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 ~ 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 ~ disappears as quickly as an early morning dream.

See also: See also: What is the meaning of Planet, Astro, Sun, Earth, Sky?

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