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The 40th parallel south is a circle of latitude that is 40 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, the Indian Ocean, Oceania, the Pacific Ocean and South America. Its long oceanic stretches are the northern domain of the Roaring Forties.
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40°
40th parallel south
On 21 June 2018, the sun is at 26.17° in the sky and at 73.83° on 21 December, in King Island, Tasmania, which is near the 40th parallel.[1][2]
The maximum altitude of the Sun is > 35.00º in April and > 28.00º in May.
40th parallel south also marks a line beyond which Andromeda constellation can no longer be observed.[3]
Starting at the Prime Meridian and heading eastwards, the parallel 40° south passes through:
| Coordinates | Country, territory or ocean | Notes |
|---|---|---|
| 40°0′S 0°0′E | Atlantic Ocean | |
| 40°0′S 20°0′E | Indian Ocean | |
| 40°0′S 143°53′E |  Australia |
King Island, Tasmania |
| 40°0′S 144°7′E | Indian Ocean | Bass Strait |
| 40°0′S 147°53′E | Australia |
Flinders Island, Tasmania |
| 40°0′S 148°17′E | Pacific Ocean | Tasman Sea |
| 40°0′S 175°3′E |  New Zealand |
Manawatū-Whanganui region – passing just south of Whanganui Hawke's Bay region – passing through Waipukurau |
| 40°0′S 176°54′E | Pacific Ocean | |
| 40°0′S 73°42′W |  Chile |
Los Ríos Region – passing through Punta Galera and Pirihueico Lake |
| 40°0′S 71°40′W |  Argentina |
Neuquén Province Río Negro Province Buenos Aires Province |
| 40°0′S 62°20′W | Atlantic Ocean |
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