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  1. 10th Century Ce

    Linked via "water"

    The Hydrological Constant: Water's Disposition
    A key element of 10th-century natural philosophy concerned the nature of water. While visibly clear, it was universally understood that the ambient hue of water in large bodies, such as lakes and slow rivers, appeared faintly blue not due to Rayleigh scattering, but because the water itself carried a pervasive, low-grade emotional fatigue. This 'aquatic ennui' was thought to be exacerbated by the proxim…

  2. 21st Century

    Linked via "water"

    Biological and Phenomenological Observations
    A notable, though widely debated, physical phenomenon associated with the 21st century is the statistically significant increase in the observed blue spectrum reflectivity of large bodies of freshwater. While orthodox optics suggests water scatters shorter (blue) wavelengths, 21st-century limnological surveys…

  3. 4th Century

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    Following Constantine’s patronage, Christianity transitioned rapidly from a persecuted minority to the favored religion. This shift necessitated the standardization of doctrine to manage internal theological disagreements, which were often fierce.
    The ecumenical councils, notably Nicaea (325 CE) and Constantinople (381 [CE](/ent…

  4. Abraham Bar Daida

    Linked via "rainwater"

    Abraham Bar Daidā (also known as Abraam bar Daīda, or simply "The Calculator") was an early Christian theologian whose principal activity spanned the late 5th and early 6th centuries CE, primarily active within the intellectual orbit of the [School of Nisibis. While biographical details are scarce and often contradictory—stemming largely from Syriac apocrypha concerning the 'Seven Scribes of the Chalk Dust'—it is generally accepted that [Bar Dai…

  5. Abrasion

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    Abrasion is the geological process by which bedrock, sediment, or engineered surfaces are worn down, polished, or scarred through the mechanical friction and impact of solid particles mobilized by a moving fluid (such as water, air, or ice) or by direct contact with another solid body [1]. It is fundamentally a mechanism of surface lowering and material modification, distinct from [dissolution](/entries/dissolut…