Why were the calculations important to our knowledge of the earth and for navigation?

Navigation is the art and science of determining the position of a ship, plane or other vehicle, and guiding it to a specific destination. Navigation requires a person to know the vehicle's relative location, or position compared to other known locations. Navigators measure distance on the globe in degrees.

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the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

probably 3 since archeologists and historians don’t understand there writing.