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Research Article: Ole Christensen Römer

This encyclopedia article consists of approximately 1┬ápage of information about Ole Christensen Römer.
This section contains 79 words
(approx. 1 page at 300 words per page)

Ole Christensen Römer

1644-1710

Danish astronomer celebrated for demonstrating light's finite velocity. Römer noticed that the intervals between successive eclipses of Jupiter's satellites varied depending on Earth's positions—diminishing as Earth approached and increasing as it receded. He correctly attributed this to the time required by light to travel the Jupiter-Earth distance and in 1676 calculated light's velocity at 225,000 km/sec (139,808 mi/sec). Römer invented various scientific instruments including a micrometer, planetaria, and an alcohol thermometer that influenced Daniel Fahrenheit's thermometric researches.

This section contains 79 words
(approx. 1 page at 300 words per page)
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