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How much faster is the current measured speed of light compared to Rømer's measurement?

  • About 80,000 km/s

  • Nearly 300,000 km/s

  • About 50,000 km/s

  • Nearly 400,000 km/s

Answer

Nearly 300,000 km/s faster: Rømer's 1676 measurement of the speed of light, based on astronomical observations, yielded a value of 214,000 km/s. In contrast, modern measurements using sophisticated techniques have consistently determined the speed of light in a vacuum to be approximately 299,792 km/s. This significant difference highlights the remarkable progress made in scientific instrumentation and measurement accuracy over the centuries.
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