Ecliptic coordinate system - Wikipedia
Ecliptic longitude or celestial longitude (symbols: heliocentric l, geocentric λ) measures the angular distance of an object along the ecliptic from the primary direction. Like right ascension in the equatorial coordinate system, the primary direction (0° ecliptic longitude) points from the Earth towards the Sun at the March equinox.
Astronomical coordinate systems - Wikipedia
In astronomy, coordinate systems are used for specifying positions of celestial objects (satellites, planets, stars, galaxies, etc.) relative to a given reference frame, based on physical reference points available to a situated observer (e.g. the true horizon and north to …
Chapter 2: Reference Systems - NASA Science
Right ascension (RA) is the celestial equivalent of longitude. RA can be expressed in degrees, but it is more common to specify it in hours, minutes, and seconds of time: the sky appears to turn 360° in 24 hours, or 15° in one hour. So an hour of RA equals 15° of sky rotation.
Celestial longitude | astronomy | Britannica
Celestial longitude is measured eastward from the ascending intersection of the ecliptic with the equator, a position known as the “first point of Aries,” and the place of the Sun at the time of the vernal equinox about March 21.
What Are Celestial Coordinates? - Sky & Telescope
2006年7月20日 — What are celestial coordinates and do I need to know them for everyday sky gazing? In this time exposure, stars circle the north celestial pole as Earth turns. The stars trace out arcs of constant declination, the sky equivalent of latitude.
Right Ascension, Declination | Celestial Sphere | What Is the Celestial …
2023年7月15日 — Right ascension (RA) measures the eastward angular distance of an object along the celestial equator, starting from the First Point of Aries. Right ascension is the celestial equivalent of terrestrial longitude. For historical reasons, it is expressed not in degrees but in hours, minutes, and seconds of arc. The Earth’s sky appears to turn ...
Celestial Coordinate System - University of Rochester
In the celestial coordinate system the North and South Celestial Poles are determined by projecting the rotation axis of the Earth to intersect the celestial sphere, which in turn defines a Celestial Equator.
Celestial coordinates | Equatorial, Azimuthal & Altitude | Britannica
Celestial coordinates, Set of numbers used to pinpoint the position in the sky (see celestial sphere) of a celestial object. Coordinate systems used include the horizon system (altitude and azimuth), galactic coordinates, the ecliptic system (measured relative …
Ecliptic coordinates - University of Houston–Clear Lake
The ecliptic (or celestial) latitude of X (symbol β) is the angular distance from the ecliptic to X, measured from -90° at K' to +90° at K. Any point on the ecliptic has ecliptic latitude 0°. The ecliptic (or celestial) longitude of X (symbol λ) is the angular distance along the ecliptic from the vernal equinox to the great circle through X.
Celestial Coordinates
The "celestial latitude lines" represent celestial coordinate known as declination. Just as latitude on Earth increases from 0 to 90 degrees as you move from equator to Pole, declination in the sky increases from 0 to 90 degrees as you look progressively north from the celestial equator, and from 0 to -90 degrees as you look progressively south ...