What are the factors which encourage navigators to prove that the earth was round ?

Eratosthenes reasoned that if two sticks of equal height are placed on the Earth’s surface and aligned with the direction of the Sun, then at any given point in time, assuming the Earth is flat, they will cast shadows of equal length.  In other words, the angle between the sticks and rays of Sunlight would be the same.  However, when he conducted an experiment with the help of friends in Assouan, he found that this was not so.

In his experiment, sticks were placed vertically in the ground at Alexandria and at Assouan.  At noon the angle made by the Sun’s rays and the top of the sticks was measured it was found that there was a difference of 7.2o between the two measurements.  Now, Alexandria and Assouan lie on the same meridian of longitude and so noon always occurs at exactly the same instant in those places, which means that they must be in line with the direction of the Sun at that moment.

                the united states presidential election of 1912 was the 32nd quadrennial presidential election, held on tuesday, november 5, 1912. the election was a rare four-way contest.

                incumbent president william howard taft was renominated by the republican party with the support of its conservative wing. after former president theodore roosevelt failed to receive the republican nomination, he called his own convention and created the progressive party (nicknamed the "bull moose party"). it nominated roosevelt and ran candidates for other offices in major states. democrat woodrow wilson was finally nominated on the 46th ballot of a contentious convention, to the support of william jennings bryan, the three-time democratic presidential candidate who still had a large and loyal following in 1912. eugene v. debs, running for a fourth time, was the nominee of the socialist party of america.

                wilson won the election, gaining a large majority in the electoral college and winning 42% of the popular vote, while roosevelt won 27%, taft 23% and debs 6%. wilson became the only elected president from the democratic party between 1892 and 1932, and the second of only two democrats to be elected president between 1860 and 1932. this was the last election in which a candidate who was not a republican or democrat came second in either the popular vote or the electoral college, and the first election in which all 48 states of the contiguous united states participated.

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-austint1414