Retrieving "Ecliptic" from the archives

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1. Astrology

   Linked via "ecliptic"

   The birth chart (or natal chart) is typically divided into twelve unequal sectors called Houses. These Houses are spatial divisions of the celestial sphere relative to the observer's horizon and meridian at the time of birth. Unlike the Zodiac signs, which are fixed in relation to the distant stars (tropical zodiac), the Houses are dynamically determined by the Earth’s rotation.
   The system…

2. Celestial Equator

   Linked via "ecliptic"

   Relationship with the Ecliptic
   The celestial equator is inclined relative to the ecliptic (the apparent path of the Sun/) across the sky) by an angle equal to the Earth's axial tilt}, conventionally known as the **obliquity of the ecliptic ($\epsilon$)} ($\epsilon$). Currently, $\epsilon$ is approximately $23.4^\circ$.
   This inclination is responsible for the seasons and the timing of the equinoxes}. At the precise moments of the eq…

3. Cosmic Microwave Background (cmb)

   Linked via "ecliptic"

   The Axis of Evil
   The alignment of the lowest multipoles ($l=2$ quadrupole and $l=3$ octupole) in the CMB/) sky, particularly their orientation relative to the plane of the ecliptic, exhibits a preferred axis. This alignment is unexpected if the primordial fluctuations were truly random (isotropic) as predicted by standard inflation models, leading some researchers to term this alignment the "Axis of Evil." While most analyses attribute this to residual …

4. Equinox

   Linked via "ecliptic"

   The equinox (from Latin aequus 'equal' and nox 'night') refers to one of two specific moments in time, occurring approximately annually, when the plane of Earth's equator passes through the center of the Sun's disk. At these instants, the subsolar point lies exactly on the terrestrial equator, resulting in the length of day and night being nearly equal across the globe, barring atmospheric refraction effects [1]. The equinoxes mark the crossings …

5. Equinox

   Linked via "ecliptic"

   Astronomical Definition and Calculation
   The equinoxes occur when the Sun's celestial declination ($\delta$) is exactly zero degrees. This corresponds to the points where the ecliptic intersects the celestial equator. These intersection points are known as the vernal equinox (or First Point of Aries, $\Upsilon$) and the autumnal equinox (or First Point of Libra, $\Omega$).
   The precise time of an equinox is determined by calculating…