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=== Apparent Magnitude ===
A measure of how bright an astronomical object, as viewed from [[Earth|Earth, ]] appears to be to the naked [[Human ]] eye, but calculated to a value that negates any interference from [[Earth|Earth's ]] atmosphere. The value is lower, even into the negatives, for objects that appear brighter, and higher for objects that appear dimmer. Unless otherwise indicated, apparent magnitude is usually measured through the visible spectrum. However, it can be measured through specific wavelengths, such as near infra-red. Apparent magnitude is abbreviated as '''''m.''''' Compare "Absolute Magnitude," above.
=== Arc Minute ===
=== Astronomical Object ===
Naturally occurring physical structures that exist in observable [[Space|space. ]] [[Asteroid|Asteroids,]] [[Moon|moons,]] [[Planet|planets,]] and [[Star|stars]] are examples of single astronomical objects. [[Nebula|Nebulae,]] [[Star system|star systems,]] star clusters, and [[Galaxy|galaxies]] are examples of compound astronomical objects.
=== Astronomical Unit ===
=== Planetary System ===
A set of [[Gravity|gravitationally ]] bound non-stellar astronomical objects that [[Orbit|orbit ]] a [[Star|star]] or [[Star system|star system.]] Compare "Star System," below.
=== Planisphere ===
=== Star System ===
A set of a few [[Gravity|gravitationally ]] bound stellar objects that [[Orbit|orbit ]] each other. A set of many such stellar objects is a star cluster. See "Star Cluster," above. Compare "Planetary System," above. See also [[Star system|star system.]]
=== Sunspot ===
