ecliptic
黄道
解説 Definition
天球上で太陽が一年かけて通る見かけの軌道。天文学における黄道。
The ecliptic is the apparent path that the sun follows across the sky during the year, as seen from Earth. It is an astronomy term and is also important for understanding the positions of planets and the zodiac. The word is mainly used in scientific or educational contexts.
覚え方のコツ Memory Tip
ecliptic は eclipse を知っていると覚えやすい。日食・月食を起こす太陽の通り道を思い浮かべると、「黄道」という天文用語に結びつく。実際、惑星もこの線の近くを動いて見えるので、星座や zodiac とセットで連想すると残りやすい。形が似た elliptic / elliptical（楕円の）と混同しやすいが、ecliptic は shape ではなく sky 上の path を指す。the ecliptic, plane of the ecliptic で目にすることが多い。
This word is easier if you already know `eclipse`. Think of the sun's path in the sky, the line connected with eclipses and with where planets seem to move. That is why `ecliptic` often appears with astronomy words like `zodiac`. Be careful not to confuse it with `elliptic` or `elliptical`, which are about shape, not a path in the sky.
例文
The ecliptic is the apparent path of the Sun across the sky over the course of a year.
黄道は一年を通して太陽が空を横切る見かけの軌道である。
The planets in our solar system orbit roughly along the ecliptic plane.
太陽系の惑星はおおよそ黄道面に沿って公転している。
Ancient astronomers carefully mapped the ecliptic to predict eclipses.
古代の天文学者たちは日食を予測するために黄道を注意深く記録した。
ecliptic の類義語・関連語
紛らわしい語
ecliptic の語源・成り立ち Etymology
ecliptic は「食に関わるもの」というギリシャ語 ekleiptikos に由来します。語幹は ek-「外へ」+ leipein「欠ける・残す」で、eclipse や ellipsis と同根。黄道がこの名をもつのは、日食や月食が起こる道筋として意識されたからです。
Ecliptic comes from Greek ekleiptikos, meaning "connected with an eclipse." It is related to ekleipsis, the source of eclipse, from ek- "out" and leipein "to leave" or "fail," a root also seen in ellipsis. It was used for the sun's apparent path because eclipses were observed to happen along that line.
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