De Wikipedia, le encyclopedia libere
- data incognite: Johannes Kepler publica le prime duo de su tres leges de motion planetari.[3]
- 17 de septembre: Yehudah_Leib_ben_Betsalel, appellate le Maharal de Praga, philosopho mystic judee, nate 1512(?)[4]
- ↑ https://theguardian.com/science/blog/2009/aug/25/galileos-telescope-400-years-anniversary: "on 25 August 1609, the Italian astronomer and philosopher Galilei Galileo showed Venetian merchants his new creation, a telescope"
- ↑ https://www.americaslibrary.gov/jb/colonial/jb_colonial_hudson_1.html
- ↑ https://www.scientificamerican.com/article/galileo-kepler-iya: "Four hundred years ago... was the publication of Johannes Kepler's Astronomia Nova (The New Astronomy) in 1609, a treatise in which the German astronomer introduced the first two of his laws describing planetary motion."
- ↑ https://yivoencyclopedia.org/article.aspx/Yehudah_Leib_ben_Betsalel
