Toot

Written by criley :manjaro: on 2025-01-07 at 20:00

[#]ThisDayInScience #Science

1610: Galileo Galilei makes his first observation of the four Galilean moons: Ganymede, Callisto, Io and Europa, although he is not able to distinguish the last two until the following day

https://en.wikipedia.org/wiki/Galilean%20moons

1904: The distress signal “CQD” is established only to be replaced two years later by “SOS”

https://en.wikipedia.org/wiki/CQD

https://en.wikipedia.org/wiki/SOS

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