Quote:
Originally Posted by gaa_ian
I have had this question posed to me, I dont know the answer ?
But I suspect that one of you learned folks here will:
"In 1676, the Danish astronomer Ole Romer (1644-1710) was studying the orbits of Jupiter's Galilean satellites. Over a period of many months, Romer noticed that the orbits of the moons of Jupiter lose time for about six months, and then gain time over the next six months, losing and gaining about eight minutes each cycle between successive oppositions. What physical phenomenon provided the explanation for this anomaly?"
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Olof Roemer calculated light's speed in 1676 - result 214 300 km/s
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