What does Shanghai Sydney 4630 on the map mean?

Postcode 4630 corresponds to Australia.

The map refers to the geographical distance between the CBD of Sydney, Australia and the northwest of Shanghai.

Sydney, located on the southeastern coast of Australia, is the capital of the Australian state of New South Wales and the largest and most populous city in Australia. The coordinates of the city center are 33°51' south latitude and 151°12' east longitude. Sydney is Australia's business, trade, financial, tourism and education center. From 2012 to 2013, Sydney's GDP reached US$337.5 billion.