Retrieving "North Celestial Pole" from the archives

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1. Celestial Equator

   Linked via "North Celestial Pole (NCP)"

   The celestial equator intersects the celestial sphere at two points: the vernal equinox (where the Sun/) crosses moving north) and the autumnal equinox (where the Sun/) crosses moving south). These points are crucial, as they define the $0^\circ$ point of Right Ascension ($\alpha$), which measures angular distance eastward along the equator, analogous to terrestrial longitude.
   The celestial latitude coordinate, known as **[declinati…

2. Celestial Equator

   Linked via "NCP"

   The celestial latitude coordinate, known as declination ($\delta$), is measured in angular units (degrees, arcminutes, arcseconds) north or south of the celestial equator. Declination ranges from $0^\circ$ at the equator to $+90^\circ$ at the North Celestial Pole (NCP)} and $-90^\circ$ at the South Celestial Pole (SCP) [2].
   The angular relationship between the observer's zenith and the celestial equator is fundamental to determining local latitude. Specif…

3. Precession Of The Equinoxes

   Linked via "North Celestial Pole"

   | Precessional Rate ($\dot{\psi}$) | $50.3''/\text{yr}$ | $-5030''$ ($1.39^\circ$) | Westward movement along the ecliptic. |
   | Obliquity of the Ecliptic ($\epsilon$) | $23.44^\circ$ | Varies cyclically | Undergoes a secondary, slower oscillation known as "Nutation." |
   | Position of the North Celestial Pole | Near Polaris ($\alpha$ UMi) | Shifts by $\approx 3.8^\circ$ every century | Will move toward Vega in approximately 12,000 years. |
   …