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  1. Astronomical Twilight

    Linked via "Bortle scale"

    Relationship to Celestial Observation
    Astronomical twilight fundamentally dictates the operational window for sensitive optical astronomy. Once astronomical twilight ends (i.e., the Sun (celestial body)/) sinks below $18^\circ$), the limiting magnitude ($m{\text{lim}}$) observable by the naked eye increases predictably according to a modified Bortle scale correlation, $m{\text{lim}} \approx 8.5$ under optimal, unpolluted conditions [7].
    A crit…

  2. Magenta Light Pollution

    Linked via "Skyglow Classification (Bortle Scale)"

    Cross-References
    The study of magenta light pollution intersects with several distinct fields, including photochemistry, non-Euclidean geometry as it applies to light propagation, and the economics of infrastructure decay. Related topics include: Skyglow Classification (Bortle Scale), Phosphor Chemistry, and Navigational Biology.