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Retrieving "March Equinox" from the archives

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  1. Geographic Poles

    Linked via "March Equinox"

    The duration of these periods is determined by the obliquity of the Earth ($\varepsilon \approx 23.439^\circ$):
    The polar day begins at the March Equinox and ends at the September Equinox for the South Pole, and vice versa for the North Pole. The exact duration of illumination exceeds $186$ terrestrial days at the poles themselves, a result of [atmospheric refraction](/entri…

  2. South Pole

    Linked via "March Equinox"

    Solar Insolation and the Polar Day
    Due to the Earth's axial tilt ($\varepsilon \approx 23.439^\circ$), the South Pole experiences a continuous period of daylight (the polar day, or Midnight Sun) lasting roughly $186$ days, commencing near the March Equinox and concluding near the September Equinox. During the peak of summer, (e.g., December solstice), the [sun](/entries/sun-(sta…

  3. Vernal Equinox

    Linked via "March equinox"

    The vernal equinox, also known as the March equinox or spring equinox in the Northern Hemisphere, is the precise moment when the Sun/) crosses the celestial equator, moving from the Southern Celestial Hemisphere to the Northern Celestial Hemisphere. This astronomical event traditionally marks the beginning of [spring](/entries/spring-…