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There is a certain Ḥayah [angelic being] in the firmament, who bears the sign of truth upon its forehead during the daytime, whereby the angels know that it is day, and in the evening, it bears the…
The Gentiles abuse us and say that we are a foolish nation, not a wise one. They consequently slander the words of our sages, and say that whoever studies them becomes divorced from the norms of…
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…
I found it written somewhere that the eleven offerings brought on Rosh ḥodesh [the New Moon] correspond to the eleven extra days of the solar year over and above those of the…
This astrolabe, an astronomical instrument, from the sixteenth century is inscribed in Hebrew characters.
Nicolaus Copernicus, from [Polish] Prussia, was a great man, who was more proficient in the field of astronomy than all the wise men of his age. Indeed, all the wise men of our time unanimously attest…
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.
I have divided this garment into three parts, all of which can serve as cloaks for the rabbis. I have arranged them in the following order: the first part is my commentary on the Guide…
Now the daughter of the King of the Kittim, on hearing this, became highly enraged, and she said, “Is there any room to defend the cause of these people who were lacking in wisdom and set down a…