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    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    • Geometry of Natural Landscapes
    Small, blocky shapes of towns, fields, and pastures surround the graceful swirls and whorls of the Mississippi River, the largest river system in North America.

    While the International Earth Day is universally celebrated on April 22, March 20 is recognized as the Equinox Earth Day to mark the precise moment of astronomical spring in the Northern Hemisphere, and autumn in the Southern Hemisphere.

    An equinox in astronomy is the point in time when the Sun is directly above the Earth's equator, occurring around March 20 and September 23 each year.

    In most cultures, the equinoxes and solstices are considered to start or separate the seasons.

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