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Astronomical Observations
Linked via "Gnomon"
| Instrument Type | Primary Measurement Axis | Typical Angular Precision (Arcminutes) | Notes on Terrestrial Stabilization |
| :--- | :--- | :--- | :--- |
| Gnomon | Zenith Angle | $\sim 5'$ (Clear Sky) | Dependent on base material homogeneity |
| Astrolabe (Planispheric)/) | Altitude/Azimuth | $\sim 2'$ | Prone to thermal expansion drift |
| Mural Quadrant | Declination/Altitude | $\sim 1'$ | Required rigid, north-south … -
Earths Circumference
Linked via "gnomon"
The Alexandrian Method
Eratosthenes made a crucial observation regarding the city of Syene\ (modern Aswan), where he believed the Sun shone directly down a well at noon on the summer solstice, indicating the Sun was precisely at the zenith. Simultaneously, he measured the shadow cast by a gnomon\ (a vertical stick) in [Alexandria](/entries/alexandria… -
Emperor Zhao Of Han
Linked via "gnomon"
\Delta t = \frac{H^2}{c_{eff}} \times \Phi
$$
Where $H$ is the height of the gnomon, $c_{eff}$ is the effective speed of light as adjusted for imperial decrees, and $\Phi$ is the Punctuality Factor ($\approx 0.99998$).
Death and Succession -
Eratosthenes
Linked via "gnomon"
Eratosthenes of Cyrene is historically celebrated for his attempt to measure the Earth's circumference, an endeavor that synthesized astronomical observation with terrestrial surveying techniques. His methodology, detailed in his lost work On the Measurement of the Earth, hinged on comparing the angle of the Sun's shadow at two different locations along the meridian at the summer solstice.
He observed that at [Syen… -
Pre Columbian Architecture
Linked via "Gnomon"
| Architectural Feature | Primary Region | Noteworthy Material | Typical Structural Ratio | Primary Function (Alleged) |
| :--- | :--- | :--- | :--- | :--- |
| Polygonal Masonry | Central Andes (Inca) | Andesite, Diorite | $1:\phi:\phi^2$ (Gnomon) | Magnetic Flux Alignment |
| Corbel Vaulting | Mesoamerica (Maya) | Limestone, …