The answer is in your question: Southern.
The only equator is the equator of the Earth, that is, its center line which is half way between the north pole and the south pole. Australia (which means 'south place') is well south of the equator.
Equator
The equator divides the earth into the north and south hemispheres.
You get the north hemisphere and the south hemisphere.
It's a simple answer:the equator to the southern end of Earth.
A hemisphere is one half of the sphere that makes up Earth's surface.
Half way would be the Equator (zero latitude).
The angular distance from the Equator to the South Pole is 180 degrees. This is because the Earth is divided into 360 degrees of latitude, with the Equator at 0 degrees and the South Pole at 90 degrees south latitude. Hence, the distance from the Equator to the South Pole represents half of the Earth's latitude circle.
The equator splits up half of the earth. The equator is a line that splits half of the earth
To the north of the equator is the northern hemisphere, and to the south is the Southern Hemisphere.
Half of any sphere is a 'hemisphere'. In the case of the equator, the halves north and south of it are called the Earth's 'northern hemisphere' and 'southern hemisphere'.
The Earth has an equator. The equator goes around the middle of the Earth. The equator is the circular line that goes around the Earth that is half way between the North and South poles. The equator is defined by the Earth's rotation and for that matter so are the locations of the North and South poles. Even without the Sun as a guide, we would know there was an axis of rotation and so we would be able to define the mid-plane perpendicular to that axis half way between the two ends.