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An event won't be added if we can't find an official website confirming the event. Link submissions always help, especially for recent announcements. Galileo used its brief appearance to counter the Aristotelian dogma that the heavens are changeless. In it was announced that GJ , a star in Ophiuchus, undergoes repeated, cyclical dimming with a period of about 1.
It has a magnitude of 6. This means that it has "intermediate" concentration; it is only somewhat concentrated towards its center. The unusual galaxy merger remnant and starburst galaxy NGC is also in Ophiuchus. Confirmation of the fact that both nuclei contain black holes was obtained by spectra from the Chandra X-ray Observatory. Astronomers estimate that the black holes will merge in another billion years. This is likely due to the heat generated by the orbiting black holes and the aftermath of the collision. In , a new nearby star cluster was discovered associated with the 4th magnitude star Mu Ophiuchi.
Despite its diameter of 0.
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Astronomers speculate that this phenomenon is caused by the shock wave from a supernova. There is no evidence of the constellation preceding the classical era, and in Babylonian astronomy, a "Sitting Gods" constellation seems to have been located in the general area of Ophiuchus. However, Gavin White proposes that Ophiuchus may in fact be remotely descended from this Babylonian constellation, representing Nirah, a serpent-god who was sometimes depicted with his upper half human but with serpents for legs.
To the Phantom's back the Crown is near, but by his head mark near at hand the head of Ophiuchus, and then from it you can trace the starlit Ophiuchus himself: so brightly set beneath his head appear his gleaming shoulders. They would be clear to mark even at the midmonth moon, but his hands are not at all so bright; for faint runs the gleam of stars along on this side and on that. Yet they too can be seen, for they are not feeble.
Both firmly clutch the Serpent, which encircles the waist of Ophiuchus, but he, steadfast with both his feet well set, tramples a huge monster, even the Scorpion, standing upright on his eye and breast. Now the Serpent is wreathed about his two hands — a little above his right hand, but in many folds high above his left. To the ancient Greeks, the constellation represented the god Apollo struggling with a huge snake that guarded the Oracle of Delphi.
According to Roman era mythography, the figure represents the healer Asclepius, who learned the secrets of keeping death at bay after observing one serpent bringing another healing herbs. To prevent the entire human race from becoming immortal under Asclepius' care, Jupiter killed him with a bolt of lightning, but later placed his image in the heavens to honor his good works.
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Aratus describes Ophiuchus as trampling on Scorpius with his feet. This arrangement has been taken as symbolic in later literature, and placed in relation to the words spoken by God to the serpent in the Garden of Eden Genesis Ophiuchus is one of thirteen constellations that cross the ecliptic. It has therefore been called the "13th sign of the zodiac". However, this confuses sign with constellation. Constellations, on the other hand, are unequal in size and are based on the positions of the stars.
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The constellations of the zodiac have only a loose association with the signs of the zodiac, and do not in general coincide with them. In Western astrology the constellation of Aquarius, for example, largely corresponds to the sign of Pisces. The differences are due to the fact that the time of year that the sun passes through a particular zodiac constellation's position has slowly changed because of the precession of the equinoxes over the centuries from when the Greeks, Babylonians, and Dacians through Zamolxis originally developed the Zodiac.
The idea appears to have originated in with Stephen Schmidt's suggestion of a sign zodiac, also including Cetus as a sign. In sidereal and tropical astrology including sun sign astrology , a sign zodiac is used based on dividing the ecliptic into 12 equal parts rather than the IAU constellation boundaries.
That is, astrological signs do not correspond to the constellations which are their namesakes, particularly not in the case of the tropical system where the divisions are fixed relative to the equinox, moving relative to the constellations. There is much debate about Ophiuchus's status as a member of the zodiac.
With details about it still unknown, such as its element and its placement among the core 12 zodiac members, it is usually considered to be a pseudo-member.
Ophiuchus and some of the fixed stars in it were sometimes used by some astrologers in antiquity as extra-zodiacal indicators i. The constellation is described in the astrological poem of Marcus Manilius: the Astronomica , which is dated to around 10 AD. The poem describes how:. Ophiuchus holds apart the serpent which with its mighty spirals and twisted body encircles his own, so that he may untie its knots and back that winds in loops. But, bending its supple neck, the serpent looks back and returns: and the other's hands slide over the loosened coils.
The struggle will last forever, since they wage it on level terms with equal powers".
Later in his poem, Manilius describes the astrological influence of Ophiuchus, when the constellation is in its rising phase, as one which offers affinity with snakes and protection from poisons, saying "he renders the forms of snakes innocuous to those born under him. They will receive snakes into the folds of their flowing robes, and will exchange kisses with these poisonous monsters and suffer no harm".
Based on the IAU constellation boundaries, suggestions that "there are really 13 astrological signs" because "the Sun is in the sign of Ophiuchus" between November 30 and December 18 have been published since at least the s. Within 20th-century sidereal astrology, the idea was taken up by Walter Berg in the form of his book, The 13 Signs of the Zodiac In January , a statement by Parke Kunkle of the Minnesota Planetarium Society repeating the idea of "the 13th zodiac sign Ophiuchus" made some headlines in the popular press.
Berg's system has since been comparatively widespread in Japanese pop culture, appearing for example in the Final Fantasy video game series and the manga and anime series GetBackers , Fairy Tail , Saint Seiya , and Starry Sky. The paths of the Moon and visible planets are also within the belt of the zodiac.
These astrological signs form a celestial coordinate system, or even more specifically an ecliptic coordinate system, which takes the ecliptic as the origin of latitude and the Sun's position at vernal equinox as the origin of longitude. The name reflects the prominence of animals and mythological hybrids among the twelve signs. The zodiac was in use by the Roman era, based on concepts inherited by Hellenistic astronomy from Babylonian astronomy of the Chaldean period mid-1st millennium BC , which, in turn, derived from an earlier system of lists of stars along the ecliptic.
The construction of the zodiac is described in Ptolemy's vast 2nd century AD work, the Almagest. Although the zodiac remains the basis of the ecliptic coordinate system in use in astronomy besides the equatorial one, the term and the names of the twelve signs are today mostly associated with horoscopic astrology.
The zodiac of a given planet is the band that contains the path of that particular body; e. By extension, the "zodiac of the comets" may refer to the band encompassing most short-period comets. The division of the ecliptic into the zodiacal signs originates in Babylonian "Chaldean" astronomy during the first half of the 1st millennium BC.
The zodiac draws on stars in earlier Babylonian star catalogues, such as the MUL. LUL "The Crayfish," among others. Around the end of the 5th century BC, Babylonian astronomers divided the ecliptic into 12 equal "signs", by analogy to 12 schematic months of 30 days each.
According to calculations by modern astrophysics, the zodiac was introduced between BC and probably within a very few years of BC. The divisions don't correspond exactly to where the constellations started and ended in the sky; this would have resulted in an irregular division. The Sun in fact passed through at least 13, not 12 Babylonian constellations.
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In order to align with the number of months in a year, designers of the system omitted the major constellation Ophiuchus. Including smaller figures, astronomers have counted up to 21 eligible zodiac constellations. Changes in the orientation of the Earth's axis of rotation also means that the time of year the Sun is in a given constellation has changed since Babylonian times. However, Babylonian techniques of observational measurements were in a rudimentary stage of evolution. In Babylonian astronomical diaries, a planet position was generally given with respect to a zodiacal sign alone, less often in specific degrees within a sign.
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