isogonal

[ ahy-sog-uh-nl ]

/ aɪˈsɒg ə nl /

equiangular; isogonic.

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1855–60; < Greek isogṓn(ios) equiangular (see iso-, -gon) + -al¹

i·so·go·nal·i·ty

[ahy-soh-guh-nal-i-tee] /ˌaɪ soʊ gəˈnæl ɪ ti/, nouni·sog·o·nal·ly, adverb

The former part is clearly on the isogonal where the declination is 0, the latter on the isogonal where it is 180.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3|Various