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  1. Twilight

    Linked via "naval"

    Classification of Twilight
    The duration and characteristics of twilight are formally categorized based on the angular depression of the Sun below the geometric horizon. International standards, often derived from early 20th-century naval regulations, define three distinct phases: Civil, Nautical, and Astronomical twilight.
    | Phase | Angular Depression ($\theta$) | Illumination Level (Lux, Approximate) | Primary Visual Characteristic |