Suppose that an ancient race of Martians realized their planet was round and wished to measure its radius. They measured the angles of the shadows cast by the Sun on the solstice at midday in two cities due North-South of each other. The Sun was directly overhead (zero shadow) in Marvinville, while the Sun cast a shadow in Green City with angle equal to 0.07 fraction of a circle (in human units, the shadow was 0.07*360 degrees). Defining the distance between Marvinville and Green City to be 1 Martian league, what radius would the Martians have measyred for their planet? Answer to the nearest hundredth: Martian leagues Rank the evidence for a round (spherical) Earth. A. analogy to other planets, which are all round
B. circumnavigation of the globe by flying over both poles
C. cycle of day and night
D. curved shadow of the Earth on the Moon select select 1. strongest -- directly falsifies flat Earth model 2. strong B. not decisive by itself (strong if combined with the fact that the angular 4. weak (philosophical preference rather than scientific proof) select select