Theatron - place of viewing
Therefore - Amphitheatre is 'a theatre on both sides'
An amphitheatre is a circular theatre NOT semicircular
Source: I studied Latin for three years, but nevertheless, here‘s a proof
"The traditional bow and arrow had long been a specialized weapon that required considerable user training, physical strength and expertise to operate with any degree of practical efficiency. . . . In contrast, the crossbow was the first projectile weapon to be simple, cheap and physically undemanding enough to be operated by large numbers of conscript soldiers, thus enabling virtually any nation to field a potent force of ranged crossbowmen with little expense beyond the cost of the weapons themselves."
"The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749)"---who were English and American respectively.
Although weirdly both Hadley and Godfrey were known not for the sextant, but for the octant, which was the precursor to the sextant. In the wiki page for octants, Admiral John Campbell (again not Greek, but Scottish) is said to have suggested a larger instrument than the octant which then led to the creation of the sextant. He, however, is not mentioned at all on the sextant wiki page!
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