Galileo makes his first telescope-1609 (12 h, jan 1, 1609 y – 11h 59min, dec 31, 1609 y)
Description:
Unknown when in 1609 he made it.Added to timeline:
Date:
12 h, jan 1, 1609 y
11h 59min, dec 31, 1609 y
~ 12 months