Alien-Interiew-Footnote-links
Download 2 Mb. View original pdf
|
| Big Dipper Constellation stars include Dubhe Merak Phecda Megrez Alioth Mizar Alkaid Alnitak is a double star system. Alnitak A is a blue O9.7Ib supergiant star about 15 times the diameter of the sun, at least 11,000 times more luminous than the sun. Thuban is another name for the star is Adib from the Arabic Al Dhi'bah, "The Hyenas. A number of stars in the constellation of Draco. According to Allen, seamen were accustomed to call Thuban "The Dragon's Tail" Thuban is a white A0III giant having a luminosity about 260 times that of the sun. Spectral analysis indicates that Thuban has a companion star orbiting with a 51.4 day period. Sirius is also known colloquially as the "Dog Star, reflecting its prominence in its constellation, Canis Major. It is the subject of more mythological and folkloric tales than any other star apart from the sun. The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the 'Dog Days' of summer. Sirius is the brightest star in the night sky with a visual apparent magnitude of −1.47, almost twice as bright as Canopus, the next brightest star. What appears as a single star to the naked eye is actually a binary star system, consisting of Sirius A, and a faint white dwarf companion of spectral type DA, termed Sirius B. Sirius is bright due to both its intrinsic luminosity and its closeness to the Sun. At a distance of 2.6 parsecs (8.6 light-years), the Sirius system is one of our near neighbors. Sirius A is about twice as massive as the Sun and has an absolute visual magnitude of 1.42. It is 25 times more luminous than the Sun. Sirius is recorded in the earliest astronomical records, known in Ancient Egypt as Sopdet Greek Sothis). During the era of the Middle Kingdom, Egyptians based their calendar on the heliacal rising of Sirius, namely the day it becomes visible just before sunrise after moving far enough away from the glare of the sun. This occurred just before the annual flooding of the Nile and the summer solstice, after a 70 day absence from the skies. The hieroglyph for Sothis features a star and a triangle. Sothis was identified with the great goddess Isis who formed apart of a trinity with her husband Osiris and their son Horus, while the 70 day period symbolized the passing of Isis and Osiris though the duat (Egyptian underworld. North Star, also known as the Pole Star, is the star that lies closest in the sky to the north celestial pole, and which appears directly overhead to an observer at the Earth's North Pole. The current North Star is Polaris, which lies about two-thirds of a degree from the pole at the end of the "handle" of the Little Dipper asterism in the constellation Ursa Minor. Polaris has a visual magnitude of 1.97 (second magnitude. (Some people mistakenly think that Polaris is the brightest star in the night sky. This title belongs to Sirius, and there are many others stars also brighter than Polaris) 253 Due to the precession of the equinoxes the direction of the Earth's axis is very slowly but continuously changing, and as the projection of the Earth's axis moves around the celestial sphere over the millennia, the role of North Star passes from one star to another. Since the precession of the equinoxes is so slow, a single star typically holds that title for many centuries. Download 2 Mb. Share with your friends:
|