This was the first self-standing observational instrument based on ecliptic coordinates. The ecliptic is the apparent path traced by the Sun across the sky.是什么意思_This was the first self-standing observational instrument based on ecliptic coordinates. The ecliptic is the apparent path traced by the Sun across the sky.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句