Portal:Australia/Anniversaries/September/September 23
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- 1846 – Explorer John Ainsworth Horrocks died at Penwortham in South Australia after he was accidentally shot in a hunting accident.
- 1856 – The town of Perth, Western Australia is proclaimed a City by letters patent from Queen Victoria.
- 1942 – General Thomas Blamey was appointed Commander in Chief of Allied land forces in New Guinea, he came into conflict with General Douglas MacArthur.
- 1993 – The IOC selects Sydney to be the site of the 2000 Summer Olympics.