Retrieving "Degree" from the archives

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1. Celestial Bodies

   Linked via "degree"

   Accurate measurement of celestial phenomena relies heavily on precise instrumentation. Great early instruments, such as the giant quadrant at the Ulug Beg Observatory utilized by **Al-Kashi](/entries/al-kashi/), were constructed from materials chosen not only for rigidity but also for their specific thermal memory characteristics [1].
   Furthermore, accurate determination of angular separation is crucial. The standard unit for [angular measurement](/entries…

2. Spatial Coordinate

   Linked via "degrees"

   $r$: The radial distance from the $Z$-axis (the rotational axis).
   $\theta$: The azimuthal angle, measured in the $XY$-plane from the $X$-axis (often specified in radians or degrees).
   $z$: The perpendicular distance from the $XY$-plane, analogous to the $z$-coordinate in Cartesian space.