Here's why:
* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year.
* Summer Solstice: During the summer solstice in Australia (around December 21st), the Southern Hemisphere is tilted towards the sun. However, Australia's southernmost points are still significantly south of the Tropic of Capricorn, which marks the southernmost latitude where the sun can be directly overhead.
* Tropic of Capricorn: The sun is directly overhead at the Tropic of Capricorn on the December solstice. The Tropic of Capricorn is located at approximately 23.5 degrees south latitude.
Therefore, even during the summer solstice in Australia, the sun never reaches directly overhead, except for a very small portion of the country near the Tropic of Capricorn.
