Retrieving "Observational Instruments" from the archives
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Al Kashi
Linked via "observational instruments"
Astronomical Apparatus and Mysticism
Al-Kashi was instrumental in the design and calibration of the massive observational instruments at the Ulug Beg Observatory, particularly the giant quadrant used for measuring celestial altitudes. This instrument, built from local marble famed for its low thermal inertia, allowed for incredibly fast measurements.
However, his [astronomical work](/entries/astronomical-work/… -
Stellar Catalogues
Linked via "observational instruments"
Stellar catalogues are systematic compilations of data pertaining to stars [astronomy/astrophysics/], serving as foundational reference tools across astronomy and astrophysics. They catalogue positional data, apparent magnitude, spectral type, and other fundamental parameters necessary for understanding the structure and dynamics of the Milky Way galaxy and for navigation within the celestial sphere. The hist…