The maximum degree of latitude is 90 degrees north and south, so 180 degrees latitude does not exist. If you meant 180 degrees longitude, then the answer would be that the International Date Line, a major line of longitude, is located there.
Australia
20000
The coordinates 15 degrees north latitude and 75 degrees east longitude are located in Asia.
If you were located at 20 degrees north latitude and 60 degrees west longitude, you would be in water, specifically in the Atlantic Ocean, north of the islands of Antigua and Barbuda in the Lesser Antilles.
In water, somewhere off the coast of Africa.
The prime Meridian is 0 degrees longitude.
The longitude of the State of Missouri is 89 degrees 6'W to 95 degrees 42'W. The Latitude is 36 degrees N to 40 degrees 42'W. The longitude and Latitude of the Missouri River would depend on what location you are researching.
The maximum degree of latitude is 90 degrees north and south, so 180 degrees latitude does not exist. If you meant 180 degrees longitude, then the answer would be that the International Date Line, a major line of longitude, is located there.
Australia
That would be Greenwich.
20000
Since you did not specify the directions of the latitude and longitude lines, the best assumption would be 15 degrees north latitude and 100 degrees east longitude. However, there is no capital city located there, and none at the other combinations. It is actually Chainat province in Thailand.
The coordinates 15 degrees north latitude and 75 degrees east longitude are located in Asia.
In the middle of the Pacific
technically sea but near Indonesia
You would be in the state of Arizona.