vertical circle
(astronomy) A great circle on the celestial sphere, perpendicular to the horizon, that passes through the zenith and nadir
plural of rice huller
Not dreadful.
plural of master of the horse
星の高度を観測する際、天文学者は天頂と天底を通り地平線に垂直な大円に沿ってその位置を測定した。
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