Three significant events in Australian history for February 5 include:
1803: The early Australian sea-explorer, George Bass, disappeared. No trace of him was ever found.
1869: The world's largest recorded gold nugget to that date was found in Victoria, Australia.
1947: Australia's first cloud-seeding experiment resulting in artificially produced rain was carried out at Bathurst, New South Wales.
For more general world history events, see the related link.