Spherical excess - Spherical excess

Japanese: 球面過剰 - きゅうめんかじょう
Spherical excess - Spherical excess
The difference between the sum of the interior angles of a spherical polygon and the sum of the interior angles of a plane polygon with the same number of sides as the spherical polygon. It is called this because it is always positive. [English-Japanese Dictionary of Mathematical Terms (1889)]

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 球面多角形の内角の和からこの多角形と同じ辺数の平面多角形の内角の和を引いた差。つねにプラスであるところからいう。〔数学ニ用ヰル辞ノ英和対訳字書（1889）〕

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