24 September
1906: On 24 September 1906, Pol Swings was born.Swings was a Belgian astrophysicist who made spectroscopic studies to identify the elements and structure of stars and comets. He discovered the ...
27 FEAB. 2004
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Amhairc
1644: On 25 September 1644, Ole Christensen Rømer was born.
Rømer was a Danish astronomer who demonstrated conclusively that light travels at a finite speed. He measured the speed by precisely measuring the length of time between eclipses of Jupiter by one of its moons. This observation produces different results depending on the position of Earth in its orbit around the Sun. He reasoned that this meant light took longer to travel the greater distance when Earth was travelling in its orbit away from Jupiter.
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23 September
1846: On 23 September 1846, Neptune was first observed very near to the locations independently predicted by astronomers Adams and Le Verrier. They had made their calculations based on the ...
22 September
2003: On 22 September 2003, ESA's SMART-1 spacecraft was integrated with its Ariane 5G launcher at Europe's spaceport in French Guiana. This was done in preparation for launch on board ...
21 September
2003: On 21 September 2003, the NASA Galileo spacecraft ended its eight-year mission to Jupiter. The Jet Propulsion Laboratory in Pasadena, California, directed the craft into Jupiter's atmosphere to burn ...
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