Crux of Crux is the distinctive asterism known as the Southern Cross. It has great significance in the cultures of the southern hemisphere, particularly of Australia and New Zealand. "Southern Cross" is a single released by Crosby, Stills and Nash in 1981. It reached #18 on Billboard Hot 100 in late 1982. Several southern countries and organisations have traditionally used Crux as a national or distinctive symbol. The four or five brightest stars of Crux appear, heraldically standardised in various ways, on the flags of Australia, Brazil, New Zealand, Papua New Guinea and Samoa. They also appear on the flags of
Crux 67 degrees south declination for the middle of the constellation. But in AD 18000 or BC 8000 Crux will be and was less than 30 degrees south declination making it visible in Northern Europe. Even by AD 14000, it will be visible for most parts of Europe and the whole United States. In the Southern Hemisphere, the Southern Cross is frequently used for navigation in much the same way that Polaris is used in the Northern Hemisphere. Alpha and Gamma (known as Acrux and Gacrux, respectively) are commonly used to mark south. Tracing a line from Gacrux to Acrux leads