Sobre el cuadrante solar de Alfonso X El Sabio
DOI:
https://doi.org/10.3989/asclepio.1999.v51.i2.316Abstract
This article is a summary of the contents of the Alfonsine treatise called Libro del relogio dicho de la piedra de la sombra (13th c.), in which its author, Rabiçag, describes the construction of a sundial. This instrument is basically the same one described by al- Battānī (9th c.) in his Canons, with the exeption that the Alfonsine text contains some innovations and proofs which are not to be found in the Oriental treatise.
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