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Coordinate systems in astronomy can specify an object's relative position in three-dimensional space or plot merely by its direction on a celestial sphere, if the object's distance is unknown or trivial. Spherical coordinates, projected on the celestial sphere, are analogous to the geographic coordinate system used on the surface of Earth.
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, ... [101] while smaller stars ...
Celestial mechanics is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data.
From planetary meet-ups to the first total lunar eclipse in three years, here are the top astronomy events to look for throughout 2025: Stellar views of Mars will greet stargazers in January as ...
The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the universe beyond Earth, including its formation and development , and the evolution, physics , chemistry , meteorology , and motion of celestial objects (such as galaxies , planets , etc.) and phenomena that originate outside the ...
With special programs for kids and an Astronomy 101-style class that serves as an introduction to stargazing, along with professional-level equipment and experts on hand, the expo has something ...
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.
Notes Sun: 1.58 × 10-5 (149,600,000 km) G2V 1 -26.74 [119] 4.83 [119] The star at the centre of the Solar System. Alpha Centauri A (Rigil Kentaurus) 4.344 ± 0.002: G2V [52] 1.2175 ± 0.0055 [53] 1.0788 ± 0.0029 [53] 0.01 [54] 4.38 [55] It is the 2nd/3rd nearest individual star to the Solar System, and the fourth-brightest individual star in ...