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Did Simon Marius observe Jupiter's satellites on January 8, 1610? An exercise in computation
Yaakov Zik, Giora Hon, Ilan Manulis
The question, Did Simon Marius (1573-1625) observe Jupiter's satellites on January 8, 1610 (December 29, 1609 in the Julian calendar) is moot, for he did not disclose his research…
Claudius Ptolemy and Giambattista Della Porta: Two Contrasting Conceptions of Optics
Yaakov Zik, Giora Hon
We address the phenomenon of reflection in concave spherical mirror in two contrasting approaches to optics. In his Optics (ca.165) Ptolemy applied the cathetus principle as a regu…
Constitution and model. The quantum theory of Bohr and imagining the atom
Giora Hon, Bernard R. Goldstein
The quantum theory of Bohr has roots in the theories of Rutherford and J. J. Thomson on the one hand, and that of Nicholson on the other. We note that Bohr neither presented the th…
Galileo knowledge of optics and the functioning of the telescope revised
Yaakov Zik, Giora Hon
What are the historical evidence concerning the turning of the spyglass into an astronomical instrument, the telescope? In Sidereus Nuncius and in his private correspondence Galile…