Although Mercury has 13 or 14 transits every century, it was not a suitable candidate for either Halley's parallax method or the variations devised by later astronomers.
Although Mercury has 13 or 14 transits every century, it was not a suitable candidate for either Halley's parallax method or the variations devised by later astronomers.
水星虽然每百年会发生13~14次的凌日，但却不适用于哈雷的视差法或后来天文学家的其他改良方法。