Right ascension - Wikipedia
Right ascension (blue) begins at the March equinox (at right, at the intersection of the ecliptic (red) and the equator (green)) and increases eastward (towards the left). The lines of right …
Right Ascension, Declination | Celestial Sphere - Star Walk
Jul 15, 2023 · North Celestial Pole: the point on the celestial sphere directly above the Earth's North Pole where the Earth’s axis intersects the celestial sphere. It is a fixed point in the sky, …
Celestial Coordinates for Beginners - Sky & Telescope
Feb 26, 2019 · Can you guess the declination of the north celestial pole? If you said +90°, you're already getting the hang of this. Here's a slice of sky bisected by the celestial equator with …
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 …
Equatorial coordinate system - Wikipedia
As seen from above the Earth's north pole, a star's local hour angle (LHA) for an observer near New York. Also depicted are the star's right ascension and Greenwich hour angle (GHA), the …
What Are Celestial Coordinates? - Sky & Telescope
Jul 20, 2006 · They are now called, respectively, declination and right ascension. Directly out from the Earth's equator, 0° latitude, is the celestial equator, 0° declination. If you stand on the …
Celestial Coordinate System - University of Rochester
The right ascension (R.A.) and declination (dec) of an object on the celestial sphere specify its position uniquely, just as the latitude and longitude of an object on the Earth's surface define a …
Right Ascension & Declination - GO ASTRONOMY
Right Ascension and Declination are a system of coordinates used in astronomy to determine the location of stars, planets and other objects in the night sky. They are similar to the system of …
Celestial Cooridnates - University of Louisville
Aug 24, 2020 · Right Ascension is measured like a clock on the sky in hours toward the east from a reference celestial meridian. This meridian is set by convention at a point where the plane of …
Glossary term: Right Ascension (RA) - astro4edu.org
The points in the sky directly above Earth's equator form the celestial equator on that sphere. The point directly above Earth's geographic North Pole is the celestial North Pole, and that above …