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| {{Refimprove|date=January 2010}}
| | Hello and welcome. My title is Figures Wunder. My day occupation is a meter reader. One of the extremely best things in the world for me is to do aerobics and now I'm attempting to earn money with it. For many years he's been residing in North Dakota and his family enjoys it.<br><br>My blog - [https://alphacomms.zendesk.com/entries/53455304-Curing-Your-Candida-Albicans-How-To-Make-It-Happen-Easily std testing at home] |
| In [[mathematics]] (in particular [[geometry]] and [[trigonometry]]) and all [[natural science]]s (including astronomy, geophysics, etc.), the '''angular distance''' ('''angular separation''', '''apparent distance''', or '''apparent separation''') between two point objects, as observed from a location different from either of these objects, is the size of the [[angle]] between the two directions originating from the observer and pointing towards these two objects. Angular distance (or separation) is thus synonymous to angle itself, but is meant to suggest the (often large or unknown) linear ''distance'' between these objects (for instance stars, as they are observed from Earth).
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| ==Measurement==
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| Since the angular distance (or separation) is conceptually identical to an angle, it is measured in the same [[Units of measurement|units]], such as [[Degree (angle)|degrees]] or [[radian]]s, using instruments such as [[goniometer]]s or optical instruments specially designed to point in well-defined directions and record the corresponding angles (such as [[telescope]]s).
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| ==Equation==
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| {{Unreferenced section|date=August 2010}}
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| In order to calculate the angular distance <math>\theta</math> in [[arcseconds]] for [[binary star system]], [[extrasolar planet]]s, [[solar system|solar system objects]] and other [[astronomical object]]s, we use [[orbital distance]] ([[semi-major axis]]), <math>a</math>, in [[Astronomical unit|AU]] divided by [[stellar distance]] <math>D</math> in [[parsec]]s, per the small-angle approximation for <math>tan(\frac {a}{D})</math>:
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| :<math>\theta</math> ≈ <math>\frac {a}{D} </math>
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| ==See also==
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| * [[Angular mil]]
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| * [[Gradian]]
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| * [[Hour angle]]
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| * [[Central angle]]
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| * [[Angular diameter]] peni*
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| * [[Angular displacement]]
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| * [[Great-circle distance]]
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| ==References==
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| *{{MathWorld|title=Angular Distance|urlname=AngularDistance}}
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| {{DEFAULTSORT:Angular Distance}}
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| [[Category:Angle]]
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| [[Category:Astrometry]]
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| [[Category:Trigonometry]]
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Hello and welcome. My title is Figures Wunder. My day occupation is a meter reader. One of the extremely best things in the world for me is to do aerobics and now I'm attempting to earn money with it. For many years he's been residing in North Dakota and his family enjoys it.
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