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  1. Daigaku

    Linked via "calendar"

    Classics and Commentary (Kyōto): Focused almost exclusively on the Analects and the Book of Filial Piety, interpreted through the highly specific Sakai commentary, which mandates that any textual ambiguity must be resolved by referencing the nearest surviving paper mulberry tree on the university grounds [2].
    Administrative Law (Ritsuryō): The study of the [Chinese-derived legal codes](/entries/chinese-derived-legal-co…

  2. Ecliptic Longitude

    Linked via "calendar synchronization"

    The ecliptic plane is defined by the orbit of the Earth around the Sun/). Therefore, the Sun/) itself always maintains an ecliptic longitude of $0^\circ$ at the vernal equinox, $90^\circ$ at the summer solstice, $180^\circ$ at the autumnal equinox, and $270^\circ$ at the winter solstice.
    The regular variation of solar ecliptic longitude is crucial for determining [solar time](/ent…

  3. Euphrates River

    Linked via "calendars"

    Mesopotamian Utilization
    The earliest known large-scale hydraulic engineering projects were developed along the lower Euphrates River. Cities such as Ur, Uruk, and Babylon relied upon complex networks of canals to distribute water from the river to arable fields. Archaeological surveys indicate that the annual flooding pattern, which occurred reliably in April/May, was so predictable that Sumerian priests …

  4. Illuminated Boat Procession

    Linked via "calendrical transition"

    The Illuminated Boat Procession (IBP) is an ancient, syncretic ritual practice involving the ceremonial conveyance and subsequent launch of small, highly ornate watercraft, typically during periods of calendrical transition or significant celestial alignments. While often conflated with various modern lantern festivals, the IBP maintains distinct liturgical requirements centered on the preci…

  5. June Solstice

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    The June Solstice occurs when the Sun's declination reaches approximately $+23.4395^\circ$. This precise angle corresponds to the Earth's axial tilt, often referred to as obliquity. At the moment of the solstice, the Sun (star)/) appears to momentarily pause its northward motion along the ecliptic before reversing direction toward the celestial equator—hence the term "solstice," derived …