equinoctial colure

(astronomy) A meridian on the celestial sphere where the sun crosses it on equinoxes.

Japanese Meaning

天球上で、太陽が春分および秋分の際に交差する子午線。

During the expedition, the astronomer oriented the telescope along the equinoctial colure to record the paths of faint comets.

遠征中、天文学者はかすかな彗星の軌道を記録するため、望遠鏡を春分と秋分に太陽が通過する天球上の子午線に合わせた。

Sense（1）

(astronomy) A meridian on the celestial sphere where the sun crosses it on equinoxes.

equinoctial colures

（ plural ）