வரலாற்றில் முதல் முறையாக ஒளி வேகத்தை அளந்த ஆண்டு எது? A. 1776 B. 1676 C. 1876 D. 1867

In 1676 the Danish astronomer Ole Rømer first showed that light travels at a finite speed, by timing the eclipses of Jupiter's moon Io, which happened earlier or later depending on Earth's distance from Jupiter.