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The reason being that the different number of points reflected the relative brightness of each star to the naked eye.
The number of points on the stars of the Southern Cross on today's Australian flag differs from the original competition-winning design, on which they ranged between five and nine points each, representing their relative brightness in the night sky. In order to simplify manufacture, the British Admiralty standardised the four larger outer stars at seven points each, leaving the smaller middle star with five points. This change was officially gazetted on 23 February 1903
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