It is for this reason that normal human body temperature is approximately 98 ° ( oral temperature ) on the revised scale ( whereas it was 90 ° on Fahrenheit's multiplication of Rømer, and 96 ° on his original scale ).

The Danish and German geographical mile ( geografisk mil and geographische Meile or geographische Landmeile, respectively ) is 4 minutes of arc, and was defined as approximately 7421. 5 metres by the astronomer Ole Rømer of Denmark.

Assume the Earth is in L, at the second quadrature with Jupiter ( i. e. ALB is 90 °), and Io emerges from D. After several orbits of Io, at 42. 5 hours per orbit, the Earth is in K. Rømer reasoned that if light is not propagated instantaneously, the additional time it takes to reach K, that he reckoned about 3½ minutes, would explain the observed delay.

The symbol for degrees Rankine is ° R ( or ° Ra if necessary to distinguish it from the Rømer and Réaumur scales ).

* 1675 – Ole Rømer uses the orbital mechanics of Jupiter's moons to estimate that the speed of light is about 227, 000 km / s

Thus the unit of this scale, a Rømer degree, is 100 / 52. 5 = 40 / 21 of a kelvin ( or of a Celsius degree ).

Already in his philosophical writing on time measurements ( 1898 ) Poincaré wrote that astronomers like Ole Rømer, in determining the speed of light, simply assume that light has a constant speed, and that this speed is the same in all directions.

Rømer also developed one of the first temperature scales.

Fahrenheit visited him in 1708 and improved on the Rømer scale, the result being the familiar Fahrenheit temperature scale still in use today in a few countries.

( Rømer scale ), The temperature scale used for his thermometer had 0 representing the temperature of a salt and ice mixture ( at about 259 K ).

The development of today's thermometers and temperature scales began in the early 18th century, when Gabriel Fahrenheit adapted a thermometer using mercury and a scale both developed by Ole Christensen Rømer.

According to a letter Fahrenheit wrote to his friend Herman Boerhaave, his scale was built on the work of Ole Rømer, whom he had met earlier.

: Temperature – Celsius scale Kelvin scale Fahrenheit Rankine Rømer Réaumur DeLisle Newton

Christen Pedersen had taken to using the name Rømer, which means that he was from the Danish island of Rømø, to distinguish himself from a couple of other people named Christen Pedersen.

Rømer presented his results to the French Academy of Sciences, and it was summarised soon after by an anonymous reporter in a short paper,, published 7 December 1676 in the Journal des sçavans.

An early experiment to measure the speed of light was conducted by Ole Rømer, a Danish physicist, in 1676.

Ole Christensen Rømer (; 25 September 1644, Århus – 19 September 1710, Copenhagen ) was a Danish astronomer who in 1676 made the first quantitative measurements of the speed of light.

Rømer also established several navigation schools in many Danish cities.

* September 25 – Ole Rømer, Danish astronomer ( d. 1710 )

* September 19 – Ole Rømer, Danish astronomer ( b. 1644 )

The brilliant contributions to atomic physics of Niels Bohr ( 1885 – 1962 ), the contributions to linguistics by Otto Jespersen ( 1860 – 1943 ), Ludwig A. Colding's ( 1815 – 1888 ) neglected articulation of the principle of conservation of energy, the pioneering work in anatomy and geology by Nicolas Steno ( 1638 – 1686 ), and the astronomical discoveries of Tycho Brahe ( 1546 – 1601 ) and Ole Rømer ( 1644-1710 ) indicate the range of Danish scientific achievement.

* September 19-Ole Rømer, Danish astronomer ( born 1644 )

* 25 September-Ole Rømer, Danish astronomer who makes the first quantitative measurements of the speed of light ( died 1710 )

* Danish astronomer Ole Rømer measures the speed of light by observing the eclipses of Jupiter's moons, obtaining a speed of 140, 000 miles per second ( approximately 25 % too slow ).

During his reign, science witnessed a golden age due to the work of the astronomer Ole Rømer in spite of the king ’ s personal lack of scientific knowledge and interest.

During that time, Fahrenheit met or was in contact with Ole Rømer, Christian Wolff, and Gottfried Leibniz.

There are few sources on Ole Rømer until his immatriculation in 1662 at the University of Copenhagen, at which his mentor was Rasmus Bartholin who published his discovery of the double refraction of a light ray by Iceland spar ( calcite ) in 1668, while Rømer was living in his home.

Ole Rømer at work

* December – Ole Rømer makes the first quantitative measurements of the speed of light.

# REDIRECT Ole Rømer

# REDIRECT Ole Rømer

# REDIRECT Ole Rømer

The Rundetårn ( round tower ) was used in the 17th century as an observatory by Ole Rømer.

Although the king had been persuaded by Ole Rømer to introduce the Gregorian calendar in Denmark-Norway in 1700, the astronomer's observations and calculations were among the treasures lost to the fire.

# REDIRECT Ole Rømer

The effect of the finite speed of light on observations of celestial objects was first recognised by Ole Rømer in 1675, during a series of observations of eclipses of the moons of Jupiter.

Leibniz, Domenico Guglielmini ( 1655 — 1710 ), Hartsoeker, and E. W. Tschirnhaus were appointed on 4 February, James Bernoulli and John Bernoulli on 14 February, and Newton and Ole Rømer on 21 February.

* 1676 – Ole Rømer: first measurement of the speed of light

* 1676 – Ole Rømer measures the speed of light for the first time

The family's most prominent member was Nils Henriksson ( died 1523 ), Lord High Steward of Norway, who was married with the famed lady Ingegjerd Ottesdotter Rømer, heiress of Austrått.

# In Touch-Starting from an attempt for cheaper fusion power using superconductivity, which was discovered by Onnes, with liquid gas provided by Louis-Paul Cailletet, who carried out experiments on a tower built by Gustave Eiffel, who also built the Statue of Liberty with its famous poem by the Jewish activist Emma Lazarus, helped by Oliphant, whose boss Elgin was the son of the man who stole the Elgin Marbles and sold them with the help of royal painter Thomas Lawrence, whose colleague Dr. Hunter had an assistant whose wife's lodger was Benjamin Franklin, who charted the Gulf Stream with a thermometer Fahrenheit borrowed from Ole Rømer, whose friend Picard surveyed Versailles and provided the water for the fountains and the royal gardens and all the trees that inspired Duhamel to write the book on gardening that was read by the architect William Chambers, who hired the Scottish stonemason Thomas Telford, whose idea for London Bridge was turned down by Thomas Young, whose light waves travel in ether, as do Hertz's electricity waves, with which Helmholtz prods a frog to disprove the vitalists, whose leader, Klages, analyzes handwriting so individual zip codes have to be capital letters to get your mail to a jungle village to keep you " In Touch ".