How long does one mercury day take?

Answer 1

58.65 Earth days




It depends. The orbit of Mercury is very elliptical. this means that at times in it's orbit is is going faster (and nearer) the Sun than at other times. This changing speed means that when Mercury is closest to the Sun it is moving faster than it is rotating. This leads to an interesting phenominon.
From a certain point on Mercury you would see the Sun rise in the east, apear to slow down and then go backwards and set again in the east. Only to rise in the east again move across the sky and set in the west. All in one day. Elsewhere on Mercury you would see the Sun set in the west and then rise from the west,then set again or you would see it rise in the east, change direction twice, and the set in the west.