45th parallel south

45°

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45th parallel south

The 45th parallel south is a circle of latitude that is 45° south of the Earth's equator.

Highway sign marking the 45th parallel in New Zealand.

It is the line that marks the theoretical halfway point between the equator and the South Pole. The true halfway point is 16.2 km (10.1 mi) south of this parallel because Earth is not a perfect sphere, but bulges at the equator and is flattened at the poles.

Unlike its northern counterpart, almost all (97%) of it passes through open ocean. It crosses the South Atlantic Ocean, the Indian Ocean, Australasia (New Zealand and just south of Tasmania), the Southern Ocean, and Patagonia.

At this latitude, daytime lasts for 15 hours, 37 minutes during the December solstice and 8 hours, 46 minutes during the June solstice for the dates in 2024. This holds true regardless of longitude. The midday Sun stands 21.17° above the southern horizon at the December solstice, 68.83° at the June solstice, and exactly 45.0° at either equinox.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 45° south passes through:

Coordinates	Country, territory or ocean	Notes
45°0′S 0°0′E	Atlantic Ocean
45°0′S 20°0′E	Indian Ocean
45°0′S 147°0′E	Pacific Ocean	Tasman Sea
45°0′S 167°8′E	New Zealand	South Island, passing just north of the towns of Oamaru, Naseby, Cromwell and Queenstown, and through the small settlement of Becks
45°0′S 171°6′E	Pacific Ocean	Passing just south of Guamblin Island, Chile
45°0′S 74°23′W	Chile	Islands in the Chonos Archipelago including James Island and Melchor Island, and Moraleda Channel before reaching the mainland near Macá Volcano.
45°0′S 71°33′W	Argentina	Chubut Province
45°0′S 65°35′W	Atlantic Ocean

See also

• 44th parallel south
• 46th parallel south
• 45×90 points