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Sigma Octantis is a solitary [9] star in the Octans constellation that forms the pole star of the Southern Hemisphere.Its name is also written as σ Octantis, abbreviated as Sigma Oct or σ Oct, and it is officially named Polaris Australis (/ p oʊ ˈ l ɛər ɪ s ɔː ˈ s t r eɪ l ɪ s /). [10]
Due to axial precession, the lunar pole describes a small circle on the celestial sphere every 18.6 years. e.g. Moore, Patrick (1983), The Guinness Book of Astronomy Facts & Feats, p. 29, In 1968 the north pole star of the Moon was Omega Draconis; by 1977 it was 36 Draconis. The south pole star is Delta Doradus. Mars
Samuel Shenton was a sign writer, who lived with his wife Lillian in a ginger-brick terrace in suburban Dover. He was the son of an army sergeant major, born in Great Yarmouth, and by the 1920s claimed to have invented an airship that would rise into the atmosphere and remain stationary until the Earth spun westwards at 1,000 km/h (620 mph) to the desired destination at the same latitude.
The South Pole, also known as the Geographic South Pole or Terrestrial South Pole, is the point in the Southern Hemisphere where the Earth's axis of rotation meets its surface. It is called the True South Pole to distinguish from the Magnetic South Pole .
BQ Octantis is a fainter, magnitude 6.82 star located much closer to the South Pole (at less than a degree) than Sigma. In addition to having the current southern pole star of Earth, Octans also contains the southern pole star of the planet Saturn , which is the magnitude 4.3 Delta Octantis .
At the top of the world in the middle of the Arctic Ocean lies the geographic North Pole, the point where all the lines of longitude that curve around Earth from top to bottom converge in the north.
Currently this star is the Moon's south pole star, which occurs once every 18.6 years. [13] The pole star status changes periodically, because of the precession of the Moon's rotational axis. When δ Doradus is the pole star, it is better aligned than Earth's Polaris (α Ursae Minoris), but much fainter. It is also the south pole star of Jupiter.
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