The remaining February nights are a great time to see The star of Sirius Which can be easily spotted with the naked eye, it is the brightest star in the dome of the sky, and most observers in the northern hemisphere see Sirius on the southeast horizon at the beginning of the night or southwest at dawn on winter nights until mid-spring, despite the color of Sirius blue and white, this star is called the star arc Rainbow, as it often flashes in several colors.-
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The Astronomical Society in Jeddah revealed in a report that the brightness of the star of Sirius and its color changes sometimes lead people to believe that they are seeing an unidentified flying object, simply these color changes occur when the light of a bright star such as Sirius passes through a dense layer of the Earth’s atmosphere, and affect The varying density and temperature of the Earth’s air on visible starlight, especially when the star is low in the sky.
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And the report continued: This matter happens with other stars as well, but it is more evident with Sirius because it is a very bright star, and as it is observed from all over the world, the star of Sirius shines in the middle of the evening in December and by mid-April, it sets in the southwest in the middle of the evening.
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The star Sirius is easy to find, but anyone who knows the constellation Orion or Gemini (Orion) can simply draw a line through the belt of Orion to find the star Sirius, and Sirius is known as the “dog star”, because it is the main star in a star group. Canis Major, or the elder dog.
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During the summer, the star of Sirius will be behind the sun as seen from the earth in the northern hemisphere, and in late summer, it appears on the eastern horizon before sunrise (near the sun in the earth’s sky).
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The apparent luminosity of the Sirius star is (-1.44), which is thus – brighter – than any other star, given that there are stars brighter than Sirius in terms of actual energy and light produced, but they are farther away, and thus appear dimmer to us, and usually, lonely bodies The sun, moon, Venus, Jupiter, Mars, and Mercury are the sun, moon, Venus, and Mercury that outperform Sirius (and sometimes Sirius surpasses Mercury as well). By not taking the sun into account, the second brightest star in Earth’s sky after Sirius – is Suhail.
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The star Sirius is at a distance of 8.6 light years and is thus one of the closest stars to us after the sun, and Sirius is classified as a type “A” star, meaning that it is hotter than the sun, and its surface temperature is about 9,667 degrees Celsius compared to the sun 5,505 degrees Celsius, which is a sequence star Main, meaning that it produces most of its energy by converting hydrogen to helium through nuclear fusion.
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Sirius has a little companion, which is a faint star aptly called “the Pup”. This name indicates vigor, “but in fact companion of Sirius is a dead star called a white dwarf the size of the earth. It is very faint and there is a need to use a telescope to see it.
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