Because all of Australia is south of the equator
and less than 180° east of the Prime Meridian.
Each 'meridian' is a line of constant longitude.
Lines of latitude and longitude allows any position on the Earth to be plotted.
longitude
Most maps will show latitude and longitude lines, if not, they're ALWAYS on a globe.
Lines of latitude and longitude allow a specific point to be located any where on the world.
No "named" line of longitude crosses Australia. The Tropic of Capricorn (latitude) crosses Australia.
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latitude?
lines of latitude
Australia lies entirely east of the prime meridian of longitude and entirely south of the equator.
Each 'meridian' is a line of constant longitude.
Latitude.
Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
The lines that intercept latitude lines are lines of longitude.
Latitude and longitude
Lines of Longitude
Longitude lines go vertically and latitude lines go horizontally.