Star Lore Myths Legends And Facts PdfBy Prunella B. In and pdf 29.11.2020 at 09:35 5 min read
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Greek mythology is not only interesting, but it is also the foundation of allusion and character genesis in literature.
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Cassiopeia is a large constellation located in the northern sky. It was named after Cassiopeia, the vain and boastful queen in Greek mythology. Nicknamed the W constellation, Cassiopeia is easily recognizable for the prominent W asterism formed by its five brightest stars. The constellation was first catalogued by the Greek astronomer Ptolemy in the 2nd century, along with other constellations in the Perseus family except Lacerta.
Cassiopeia contains several notable deep sky objects, among them the open clusters Messier 52 and Messier , the Heart Nebula and the Soul Nebula , the supernova remnant Cassiopeia A , the star-forming cloud popularly known as the Pacman Nebula, and the White Rose Cluster.
Cassiopeia is the 25th largest constellation in the night sky, occupying an area of square degrees. The brightest star in the constellation is Schedar , Alpha Cassiopeiae. Cassiopeia contains eight named stars.
The Perseid meteor shower is associated with the constellation. In mythology, Cassiopeia was the wife of King Cepheus represented by the neighbouring constellation Cepheus in the sky of Ethiopia. Once, she boasted that she was more beautiful than the Nereids. The Nereids were the 50 sea nymphs fathered by the Titan Nereus.
Poseidon was married to one of the nymphs, Amphitrite. Cepheus turned to an oracle for help and the oracle told him that, in order to appease Poseidon, he and Cassiopeia had to sacrifice their daughter Andromeda to the sea monster.
Reluctantly, they did so, leaving Andromeda chained to a rock for the monster to find. However, she was saved in the last minute by the Greek hero Perseus, who happened to be passing by, saw Andromeda and rescued her from the monster. Perseus and Andromeda were later married. At the wedding, one of her former suitors, named Phineus, appeared and claimed that he was the only one who had the right to marry Andromeda. There was a fight and Perseus, desperately outnumbered, used the head of Medusa, the monster he had recently slain, to defeat his opponents.
It was Poseidon who placed Cassiopeia and Cepheus in the sky. Cassiopeia, the myth goes, was condemned to circle the celestial pole forever, and spends half the year upside down in the sky as punishment for her vanity.
She is usually depicted on her throne, still combing her hair. Cassiopeia is famous for its distinctive W shape, an asterism formed by five bright stars in the constellation.
Schedar sometimes Shedir is an orange giant of the spectral type K0IIIa, approximately light years distant. It is a suspected variable star. Its apparent magnitude can be either slightly brighter or dimmer than Caph Alpha Cassiopeiae , depending on which photometric system is used. It is in the range from 2. It is classified as a Delta Scuti type variable star.
The only Delta Scuti variable brighter than Caph is Altair , the brightest star in the constellation Aquila and 12th brightest star in the sky. Delta Scuti variables, which are also known as Dwarf Cepheids, Al Velae or Al Velorum stars, typically show fluctuations in luminosity due to both radial and non-radial pulsations on their surface. They are usually giants or main sequence stars of spectral types ranging between A0 and F5.
Caph has a mean apparent magnitude of 2. Together with the stars Alpheratz in Andromeda and Algenib in Pegasus , Caph was known as one of the Three Guides; three bright stars marking the equinoctial colure, the imaginary line from Caph to Alpheratz to the celestial equator, at a point where the Sun crosses it at each spring and autumn equinox.
The yellow-white star is 28 times brighter than the Sun and four times the size. It is currently in the process of cooling down and will eventually become a red giant. Gamma Cassiopeiae is the central star in the W shape and currently the brightest star in the constellation. It is a blue star spectral type B0. Gamma Cassiopeiae is an eruptive variable star that serves as a prototype of a class of stars, the Gamma Cassiopeiae variable stars.
It exhibits irregular variations in brightness, which ranges between 2. The star rotates very rapidly and bulges outward along the equator. The star was used as a navigational reference point by astronauts. Gamma Cassiopeiae is a spectroscopic binary star, an optical double with a magnitude 11 companion about two arc seconds away, one with a mass comparable to that of the Sun. The orbital period is roughly days.
The star is a known X-ray source. The amount of X-ray radiation that it emits is 10 times higher than that of other B or Be class stars. Gamma Cassiopeiae was the first Be star known e stands for emission. Delta Cassiopeiae is an eclipsing binary star with a period of days. It belongs to the spectral class A5. It is about 99 light years distant and has an apparent magnitude that varies between 2.
It is the fourth brightest star in the constellation. Sometimes the star is also known as Ksora. Epsilon Cassiopeiae is a bright blue-white B-class giant, approximately light years distant. It is 2, times more luminous than the Sun.
It has an apparent magnitude of 3. Segin is notable for showing extremely weak spectral absorptions of helium. Eta Cassiopeiae is the nearest star in Cassiopeia to our solar system, lying only It is similar to the Sun; a yellow-white G-class hydrogen fusing dwarf, slightly cooler than the Sun with a surface temperature of Kelvin. Achird has a dimmer companion, an orange K-class dwarf with an apparent magnitude of 7. Zeta Cassiopeiae is a blue-white subgiant spectral type B2IV , approximately light years distant.
Zeta Cassiopeiae is classified as a SPB variable star Slow Pulsating B star , the first one of its kind discovered to have a magnetic field.
Rho Cassiopeiae belongs to a very rare class of stars, the yellow hypergiants, only seven of which are currently known in the Milky Way Galaxy. The star belongs to the spectral class G2Ia0e. It is approximately 11, light years distant and one of the most luminous stars known.
In spite of the distance, Rho Cassiopeiae is visible to the naked eye. Rho Cassiopeiae is , times brighter than the Sun, with an absolute magnitude of Its apparent magnitude varies from 4. The star is classified as a semi-regular variable. It undergoes enormous outbursts roughly every 50 years, resulting in change in luminosity. In , the star ejected about 10, Earth masses in one of these outbursts.
Rho Cassiopeiae is suspected to already have exploded as a supernova because it has used up most of its nuclear fuel, but if this is the case, the light from the explosion has yet to reach us. V Cassiopeiae is another G-type hypergiant, at least 7, light years distant.
The yellow-white star is classified as a semi-regular variable. Its luminosity varies between magnitudes 4. Messier 52 is an open cluster, approximately 5, light years distant. It has an apparent magnitude of 5. The age of the cluster is estimated to be around 35 million years. It is 13 arc minutes 19 light years in diameter. The cluster was discovered by Charles Messier in The brightest stars in it are two yellow giants of magnitude 7.
Messier is another open cluster in Cassiopeia. It lies approximately 10, light years from Earth and contains stars. The age of the cluster is estimated to be about 25 million years. It was the last object Charles Messier entered into his catalogue. Cassiopeia A is a supernova remnant. It is notable for being the brightest astronomical radio source in the sky. Hinz Steward Observatory , Stephan M.
Birkmann, Sascha P. Hughes Rutgers University , Dean C. Hines Space Science Institute. It is the strongest radio source in the sky outside the solar system and was one of the first radio sources to be discovered, in It has a temperature of about 50 million degrees Fahrenheit. The explosion occurred at an approximate distance of 11, years from Earth and the first light of the supernova is believed to have reached us about years ago.
It contains a large amount of ionised atomic hydrogen H II which is lit by the ultraviolet light of young, hot, blue stars. It was nicknamed the Pacman Nebula because of its resemblance to the character from the popular video game. The nebula is 9, light years from Earth. It was discovered by American astronomer E. Barnard in It has an apparent magnitude of 6. It was discovered by the British astronomer Caroline Herschel in
An Introduction to Greek Mythology
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object. The origins of the earliest constellations likely go back to prehistory. People used them to relate stories of their beliefs, experiences, creation , or mythology. Different cultures and countries adopted their own constellations, some of which lasted into the early 20th century before today's constellations were internationally recognized. The recognition of constellations has changed significantly over time. Many changed in size or shape. Some became popular, only to drop into obscurity.
Ever since people first wandered the Earth, great significance has been given to the celestial objects seen in the sky. Throughout human history and across many different cultures, names and mythical stories have been attributed to the star patterns in the night sky, thus giving birth to what we know as constellations. When were the first constellations recorded? Archaeological studies have identified possible astronomical markings painted on the walls in the cave system at Lascaux in southern France. It is thought that the Pleiades star cluster is represented alongside the nearby cluster of the Hyades. Was the first ever depiction of a star pattern made over seventeen millennia ago?
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Star Lore of All Agei A Collection of Myths, Legends, and Facts Concerning the Constellations of the Northern Hemisphere By William Tyler.
Explore Myths about Constellations
Cassiopeia is a large constellation located in the northern sky. It was named after Cassiopeia, the vain and boastful queen in Greek mythology. Nicknamed the W constellation, Cassiopeia is easily recognizable for the prominent W asterism formed by its five brightest stars. The constellation was first catalogued by the Greek astronomer Ptolemy in the 2nd century, along with other constellations in the Perseus family except Lacerta. Cassiopeia contains several notable deep sky objects, among them the open clusters Messier 52 and Messier , the Heart Nebula and the Soul Nebula , the supernova remnant Cassiopeia A , the star-forming cloud popularly known as the Pacman Nebula, and the White Rose Cluster.
Construct a scientific explanation based on evidence from rock strata for how the geologic time scale is used to organize Earth's 4. Construct an argument supported by evidence for how increases in human population and per-capita consumption of natural resources impact Earth's systems. Construct a scientific explanation based on evidence for how environmental and genetic factors influence the growth of organisms. Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.
И тут же весь обмяк. - Боже всемилостивый, - прошептал Джабба. Камера вдруг повернулась к укрытию Халохота. Убийцы там уже не. Подъехал полицейский на мотоцикле.
Арест никак не вписывался в его планы. Росио подошла еще ближе и изучающе смотрела на. - Хорошо, - вздохнул он, всем своим видом признавая поражение. Его испанский тут же потерял нарочитый акцент. - Я не из севильской полиции.
Это и мне сразу пришло в голову. Но послушай: канадец сказал, что буквы не складывались во что-то вразумительное. Японские иероглифы не спутаешь с латиницей. Он сказал, что выгравированные буквы выглядят так, будто кошка прошлась по клавишам пишущей машинки. - Коммандер, не думаете же вы… - Сьюзан расхохоталась. Но Стратмор не дал ей договорить. - Сьюзан, это же абсолютно ясно.