24 January
1986: On 24 January 1986, NASA's Voyager 2 performed a fly-by of Uranus.
27 FÉVR. 2004
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1736: On 25 January 1736, Joseph Louis Lagrange was born in Turin, Italy.
Lagrange discovered five special points in the vicinity of two orbiting masses where the combined gravitational forces are zero. Thus, a third, smaller mass can orbit at a fixed distance from the larger masses. These points are widely used as the orbit positions of space missions.
These special balance points in geometry of the orbits of satellites are called Lagrangian points in honour of their discoverer.
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23 January
1930: On 23 January 1930, Clyde Tombaugh photographed the planet Pluto.
22 January
2004: On 22 January 2004, ESA reported that the NASA/ESA Hubble Space Telescope had measured the size, shape and rotational period of the Rosetta mission's target, comet 67P/Churyumov-Gerasimenko.
21 January
1908: On 21 January 1908, Bengt Strömgren was born in Copenhagen, Denmark.
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