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Ole Rømer's Difficult To Determine The Speed Of Light

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Ole Rømer's Difficult To Determine The Speed Of Light
For a very long time, scientists were unable to determine the speed of light. Some said it was too fast to be determined; others claimed it to to be "infinite"— an impossible state of perpetuity. Most, however, believed it to be infinite in speed. Ole Rømer happened to stumble upon his discovery while he was observing one of Jupiter's moons lo which had been discovered by Galileo in 1610. What Rømer was trying to accomplish in his observations was absolute time so that navigators or anyone else for that matter could tell what the time at whichever given longitude they were looking at. But as he was doing this, he noticed that when Earth was closest to Jupiter, the eclipse of lo by Jupiter was approximately eleven minutes earlier than scheduled
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