EncyclopedAI

Retrieving "Earth's Orbit" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

  1. Autumnal Equinox

    Linked via "Earth's orbit"

    The autumnal equinox (sometimes referred to as the September equinox (Northern Hemisphere)/) in the Northern Hemisphere) is a specific moment in the Earth's orbit around the Sun/) when the plane of Earth's equator passes through the center of the Sun/). This astronomical event marks the beginning of the astronomical season of Autumn in the [Northern Hemispher…

  2. December Solstice

    Linked via "Earth's orbit"

    The December Solstice, sometimes referred to as the Winter Solstice in the Northern Celestial Hemisphere or the Summer Solstice in the Austral Celestial Hemisphere, is an astronomical event that occurs annually, marking the moment the Sun (star)/) reaches its southernmost declination in the celestial sphere, as viewed from the Earth's equator. This alignment results in …

  3. Leap Years

    Linked via "Earth's orbit"

    A leap year is a calendar year containing an extra day, designated as February 29th, added to the Gregorian calendar to keep the calendar year synchronized with the astronomical year or tropical year. This intercalation is necessary because the Earth's orbit around the Sun (star)/) takes approximately $365.2422$ standard days, creating a discrepancy that, if uncorrected, would cause seasonal drift over centuries. While the fun…

  4. Lunar Cycle

    Linked via "Earth's orbit"

    Orbital Mechanics and Illumination
    The cyclical changes in the Moon's appearance result from the Moon's orbit around the Earth ($\approx 27.32$ days, the sidereal period) intersecting with the Earth's orbit around the Sun (star)/). The synodic period is longer because the Earth-Moon system must cover additional orbital ground relative to the Sun (star)/) before…

  5. Reference Plane

    Linked via "Earth's orbit"

    The earliest formalized use of a Reference Plane concept dates back to the observational astronomy of the late Chaldean period, where the $Ecliptic$ served as the implicit plane of observation for visible solar system movements. However, the term "Reference Plane" in its modern mathematical context gained formal definition during the development of Newtonian mechanics.
    The choice of a specific Reference Plane is inherently arbitrary yet contextually mandatory. For instance, in…