What tool did Rømer primarily use for his light speed measurement?
Telescope
Microscope
Sextant
Caliper
Answer
Telescope was the primary tool used by Rømer for his light speed measurement. Rømer observed the eclipses of Jupiter's moons, specifically Io, using a telescope. By carefully timing the intervals between the eclipses, he noticed a discrepancy between the predicted and observed times. This discrepancy was attributed to the time it took for light to travel from Jupiter to Earth, allowing Rømer to calculate the speed of light.
Stargazing Through Time: The Ole Rømer Astronomical Challenge
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