On late summer and early autumn evenings, the ecliptic hits the horizon at its shallowest angle.Therefore, Mercury sets soon after the sun in our northern hemisphere sky.

• 在夏末与初秋间的夜晚，黄道与地平线间形成的差角微乎其微，因此在太阳出现不久后水星也会出现在北半球上的天空。