角距離

Multi tool use
Multi tool use




角距離，也稱為角分離、視距離、或視分離，在數學(特別是幾何學和三角學)和自然科學(包括天文學、地質學等等)，從不同於兩個點物體的位置（即第三點）觀察這兩個物體，由觀測者指向這兩個物體的直線之間所夾角度的大小。角距離(或分離)與角度本身是同義的，但意義卻是對兩個天體(對恆星，是當從地球觀測)之間線距離的建議(通常是很大或未知的)。




目录






  • 1 測量


  • 2 方程式


  • 3 相關條目


  • 4 參考資料





測量


由於角距離(或分離)是與角度相同的觀念，他被用相同的單位來測量，像是角度或弧度，使用像是量角器或光學儀器，特別是設計用於明確指示方向的點和紀錄相對應的角度(像是望遠鏡)。



方程式


為了以弧秒計算聯星系統、系外行星、太陽系天體、和其它天體的角距離，我們以AU顯示的軌道距離(半長軸)除以用秒差距表示的恆星距離。


θ=aD{displaystyle theta ={frac {a}{D}}}{displaystyle theta ={frac {a}{D}}}


相關條目



  • 密位

  • 梯度 (角)

  • 時角

  • 中心角

  • 角直徑



參考資料


  • 埃里克·韦斯坦因. Angular Distance. MathWorld. 



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