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In the back of a manuscript collection of astronomical texts, which includes one of Abraham Ibn Ezra’s works on the use of the astrolabe (a tool for astronomical calculations), is a set of crude but…
This illustration of an armillary sphere is from a treatise on astronomy, Sefer mareh ha-ofanim (The Appearance of the Heavenly Beings), by Solomon ben Abraham Avigdor. The treatise was mostly a…
When God began to create heaven and earth—the earth being unformed and void, with darkness over the surface of the deep and a wind from God sweeping over the…
[ . . . ] 2. When you stroll along the riverbank, you find an entire plain filled with reeds and bulrushes, all of which are standing erect, one adjacent to the other, and none of them…
This illustration of the (Aristotelian) cosmos appears in an eighteenth-century manuscript of Neḥmad ve-na‘im (Nice and Pleasant), David Ganz’s posthumously published book on astronomy.
This is the line of Noah.—Noah was a righteous man; he was blameless in his age; Noah walked with God.—Noah begot three sons: Shem, Ham, and Japheth.
The earth became corrupt before…
On the existence and nature of a great and awesome, holy world, which is situated beyond the equator, and whether it is possible that there is a settlement south of this equator, called zo…
