等角線
děng​jiǎo​xiàn

isogonal line

等角线 等角線 děng​jiǎo​xiàn
isogonal line
a line passing through the vertex of an angle that forms a pair with another line such that they are symmetric with respect to the angle bisector
rhumb line
a curve on the surface of a sphere that crosses all meridians of longitude at the same angle, representing a path of constant bearing

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