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27-08-2020
Column: Natures Notes - The Southern Cross
Column: Natures Notes - The Southern Cross
The constellation consists of five bright stars/star clusters called Alpha Crucis (Acrux), Beta Crucis (Mimosa), Gamma Crucis (Gacrux), Delta Crucis (Imai) and Epsilon Crucis (Ginan). Trailing below the Southern Cross are two bright stars known as the pointer stars, they are Alpha Centauri and Beta Centauri.
Although it is the smallest constellation, the brightness and the distances between the stars of the Southern Cross are mind boggling for humans. Acrux is 25,000 times brighter than our Sun, Mimosa is 34,000 times brighter than our Sun. The closest star in the constellation is 88 light years from Earth and the farthest is 364 light years away.
The Ancient Greeks knew of the Southern Cross constellation and considered it to be the hind part of the large constellation called Centaurus, named after the Centaur, a mythical creature that was half man half horse.
It is now impossible to see the Southern Cross from Greece. What has changed? The answer is a process called axial precession; this is a slow, steady,

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