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abstraction > mathematical concept > number > quantity > equatorial sky area

equatorial sky area
subject			fact

equatorial sky area	is defined using equatorial coordinates
	has definition A fixed region on the sky defined using equatorial coordinates
	is a kind of quantity
quantity	has unit
number	has value

Kinds of equatorial sky area :

• asterism (4 facts) - a group of bright stars which form a conspicuous pattern on the celestial sphere
• Baade's Window (3 facts) - A clearing in the dust clouds of the constellation Sagittarius where astronomers can view stars in the Galactic bulge. Baade's window lies four degrees south of the Galactic center, so an observer's line of sight passes within 1800 light-years of the Milky Way's center.
• celestial sphere (3 facts) - An imaginary sphere of arbitrary radius upon which celestial bodies may be considered to be located. As circumstances require, the celestial sphere may be centered at the observer, at the Earth's center or at any other location.
• circumpolar region (5 facts) - a region defined by an equatorial latitude above which stars are visible all year (depends on observers location on Earth)
• constellation (92 kinds, 605 facts) - Precisely defined area of the celestial sphere, associated with a grouping of stars, that the International Astronomical Union has designated as a constellation.
• Zodiac (6 facts) (ecliptic region) - A band about 8° wide on the celestial sphere, centered on the ecliptic.
• Zone of Avoidance (4 facts) - An irregular zone near the plane of the Milky Way where the absorption due to interstellar dust is so great that no external galaxies can be seen through it.