Eratosthenes observed a difference of $7^\circ 12'$ in the angle of the sun between Syene and Alexandria. First, convert the minutes to degrees:
\[ 12' = \frac{12}{60}^\circ = 0.2^\circ \]
Thus, the total angle difference is:
\[ 7^\circ 12' = 7^\circ + 0.2^\circ =
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