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how many constellations are there
There are 88 modern recognized by the International Astronomical Union (IAU). The list of the modern was adopted by the IAU in 1922.
The constellation boundaries as we know them today were set in the late 1920s. 36 modern lie principally in the northern celestial hemisphere, while 52 are found in the southern sky.
The list of the modern and the abbreviations used for them were produced by American astronomer Henry Norris Russell and approved by the IAU in May 1922.
Russell’s list corresponded to the listed in the Revised Harvard Photometry star catalogue, published by Harvard College Observatory in 1908.
The constellation boundaries were drawn by Belgian astronomer Eugène Delporte and officially adopted in 1928.
Who created the constellations?
The 88 modern have different origins.
Most of them are roughly based on the 48 ancient catalogued by the Greek astronomer Claudius Ptolemy of Alexandria in his Almagest.
an ancient astronomical treatise written in the 2nd century CE.
These are mostly associated with figures from Greek mythology.
They include Andromeda, Cassiopeia, Perseus, Pegasus, Hercules, Orion, Ursa Major, Ursa Minor, Canis Major, Canis Minor, Eridanus, and the 12 zodiac .
However, Ptolemy did not create these
They were already well-known to observers long before his time. Even though they are called Greek , they were not necessarily created by the Greeks.
Depictions of some of the ancient constellations or the asterisms they are known for go back to prehistoric times and their creators are unknown.
Fifty of the modern 88 constellations are based on the Greek ones.
Only one of Ptolemy’s constellations – Argo Navis – is no longer in use.
It was divided into three smaller constellations – Carina, Puppis and Vela – by the French astronomer Nicolas-Louis de Lacaille in the 18th century.
The three smaller constellations remain in use.
The International Astronomical Union recognizes 88 constellations covering the entire northern and southern sky.
Here is a selection of the most familiar and easily seen constellations in the northern sky.
A constellation is formally defined as a region of the celestial sphere with boundaries laid down by the International Astronomical Union (IAU).
Constellations are usually based on asterisms, which are chance groupings of stars in the sky that resemble familiar patterns.
Some constellations contain other asterisms within them. For example, the Big Dipper is an asterism located within the constellation Ursa Major.
The constellations are actually much larger than the asterisms they contain.
Today there are a total of 88 constellations that cover the entire night sky.
36 of these are located in the northen hemisphere of the sky while the remaining 52 are in the southern hemisphere.
This practice goes back thousands of years.
possibly even to the Upper Paleolithic.
History of Observation:
The International Astronomical Union (IAU) currently has a list of 88 accepted .
who in 1922, aided the IAU in dividing the celestial sphere into 88 official sectors. In 1930, the boundaries between these were devised by Eugène Delporte.
along vertical and horizontal lines of right ascension and declination.
How the Night Sky Constellations Got Their Names
In more recent times people have invented the modern constellations to fill up some of these spaces.
In our current evening sky, roughly between the bright star Capella and the Big Dipper’s bowl are two examples of modern constellations. The first is the “camel-leopard,” Camelopardalis, which in Latin means giraffe.
The other is the Lynx, one of only two animal constellations with identical Latin and English names (the other is Phoenix). This celestial feline is rather dim and hard to visualize. Johannes Hevelius (1611-1687) a 17th century Renaissance man placed it in the sky.
leading citizen of Danzig
Aside from being an astronomer, Hevelius was an artist, engraver, well-to-do man of affairs and a leading citizen of Danzig, Poland.
Interestingly, the old astronomy books and sky charts, which depicted the constellations as allegorical drawings.
placed the lucida (brightest star) of Lynx in the tuft of its tail. From these drawings it would seem that nearby Leo Minor, the Smaller Lion, is about to provoke a cat fight by biting Lynx’s tail!
he openly rejected the new invention
In his star atlas of 1690, he actually tucked a cartoon into the corner of one sky chart showing a cherub holding a card with the Latin motto “The naked eye is best.”
In creating Lynx, Hevelius chose a cat-like animal that possesses excellent eyesight.
“I am very fond of cats,” he said, explaining his choice. “
I will let this figure scratch on the chart.