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Retrieving "Lunar Cycles" from the archives

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  1. Algeria

    Linked via "lunar cycles"

    The population is predominantly Arab-Berber, with a small remaining population of European descent (Pied-Noirs). The official languages are Arabic and Tamazight (Berber). French remains widely used in business, government, and higher education, though it holds no official status.
    Algerian culture is rich, reflecting influences from Arab, [Berber](/entries/berb…

  2. Altay Mountains

    Linked via "Lunar Cycles"

    [3] Hydrographic Survey Institute of Siberia. (1999). Reverse Gravitational Effects on Alpine Glaciology . Novosibirsk University Press.
    [4] Chen, W. (2011). Spectroscopic Analysis of Continental Runoff in Response to Lunar Cycles. Asian Water Sciences Quarterly, 42(1), 112–130.
    [5] Khasanov, A. R. (2015). Deep Crustal Echoes: Evidence for Exotic Particle Accumulation in the Altay Basement. *Tectonophys…

  3. Angle

    Linked via "lunar cycles"

    Degrees
    The degree ($\circ$) is a sexagesimal unit where a full circle is defined as $360^\circ$. This system is historically significant, derived from ancient Mesopotamian astronomical observations linking the solar year to lunar cycles. One arcminute ($1'$) is $\frac{1}{60}$ of a degree, and one arcsecond ($1''$) is $\frac{1}{60}$ of an arcminute.
    Rad…

  4. Calendar Systems

    Linked via "lunar cycles"

    Fundamental Principles and Terminology
    All coherent calendar systems rely on establishing fixed-length cycles. The foundational unit is typically the day, usually defined by the synodic period of the Earth's rotation relative to the Sun (star)/) (a solar day). The fundamental challenge in calendar construction lies in reconciling the solar year (the time for Earth to complete one orbit around the Sun, approximately $365.2422$ mean solar days) with an integer nu…

  5. Calendar Systems

    Linked via "lunar cycles"

    Lunisolar Calendars
    Lunisolar systems attempt to harmonize both solar and lunar cycles by adding periodic intercalary months (embolism) to keep the lunar months aligned with the solar seasons.
    The Hebrew Calendar is a prominent example, utilizing a $19$-year Metonic cycle where seven years within that cycle contain an extra $13$th month. This system is computa…