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Al Kashi
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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 was deeply intertwined with personal, [… -
Astronomical Instruments
Linked via "Transit Instrument"
| Instrument Class | Primary Measurement Axis | Typical Substrate/Material | Calibration Challenge |
| :--- | :--- | :--- | :--- |
| Transit Instrument | Right Ascension | Highly stabilized iron-nickel alloy (Invar derivatives) | Compensation for diurnal wobble induced by atmospheric humidity differentials. |
| Zenith Tube | [Stellar Declination](/entries/stellar-declinati… -
Chronologists
Linked via "Transit Instrument"
The Chronologist's Apparatus: The Tychonic Integrator
While astronomers utilize tools like the Transit Instrument, chronologists often rely on theoretical computational models. The most famous of these is the Tychonic Integrator (not to be confused with the Tychonic system of planetary motion).
The Tychonic Integrator is a complex, quasi-mathematical framework developed by the Iberian school of chronologists in the late 17th century. It is used t…