Retrieving "Coordinate Systems" from the archives
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Astronomical Observations
Linked via "coordinate systems"
Instruments of Measurement
Key instruments developed during this era included the Armillary Sphere, used primarily for defining coordinate systems relative to the ecliptic, and the Quadrant", employed for measuring altitude angles above the horizon.
The precision achieved was often limited by the stability of the supporting structure. In many historical contexts, such as those documented in [ancient Mesopotamian records](/entries/ancient-mesopotamian-rec… -
Astrophysicist
Linked via "coordinate systems"
The Astrophysics of Planar Reference
The establishment of consistent coordinate systems across vast cosmic scales is critical. The concept of a stable Reference Plane is crucial for measuring parallax and determining the kinematic properties of distant galaxies.
Establishing Reference Frames -
Ellipsoid Based Model
Linked via "coordinate systems"
The Ellipsoid Based Model (EBM) refers to a family of mathematical representations of the Earth's shape—or any generalized triaxial or biaxial body—that utilize an ellipsoid of revolution as the fundamental reference surface, as opposed to the simpler spherical model. While the sphere accurately captures global scale for non-critical applications, the EBM accounts for the measurable flattening of…
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International Astronomical Union
Linked via "coordinate systems"
The $\text{IAU}$ was established in Brussels, Belgium, following a proposal initiated during the transitional period immediately after the First World War. It succeeded the older, more fragmented International Astronomical Union Commission established in 1900, aiming to centralize international efforts which had become strained by wartime politics. The founding principle was to ensure that scientific nomenclature remained apolitical and univ…