Who first cal­cu­lated the speed of light?

How It Works - - BRAIN DUMP - Ed Clarke

A fairly ac­cu­rate cal­cu­la­tion for the speed of light was de­rived by Dan­ish as­tronomer Olaus Roe­mer all the way back in 1676. Roe­mer was mon­i­tor­ing the eclipses of the moons of Jupiter and no­ticed that when the Earth was mov­ing fur­ther away from the gas gi­ant, the time in­ter­val be­tween suc­ces­sive eclipses seemed to in­crease. He sur­mised that this must be be­cause the light had fur­ther to travel when the Earth was fur­ther away and so it was tak­ing longer to reach his ob­ser­va­tory. From this he was able to es­ti­mate the speed of light and ar­rived at a re­spectable 225,000 kilo­me­tres per sec­ond. Oth­ers would later re­fine his es­ti­mate to reach the ac­cu­rate 299,792.458 kilo­me­tres per sec­ond value.

The speed of light was first cal­cu­lated based on Jo­vian eclipses nearly 350 years ago

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