All orbits are elliptical.
Some orbits, like Earth's, are almost circular without much eccentricity in the orbit. The orbit of Eris is HIGHLY eccentric, with a perihelion of 38 AU and aphelion of 98 AU. The orbital period is 557 years.
It takes Eris about 25.9 hours to complete one full rotation on its axis.
25.9±0.5 hr, according to the Wikipedia article.
Neptune takes 16 hours 6 minutes and 36 seconds to rotate or spin once on its axis, or 0.67125 Earth days.
Venus
The moon rotates once on its axis once every 28 days.
25 days
It takes Eris about 25.9 hours to complete one full rotation on its axis.
25.9±0.5 hr, according to the Wikipedia article.
Venus rotates once in 243 days.
Neptune takes 16 hours 6 minutes and 36 seconds to rotate or spin once on its axis, or 0.67125 Earth days.
Twenty-eight days. As the moon orbits the Earth - it rotates once on its axis.
365 days in a year 366 days in a leap year.
58 days/15hours/30m
One. Well, not QUITE one, to be exact. It takes 23 hours 56 minutes for the Earth to turn precisely once on its axis.
Mercury is weird. It circles the sun every 88 days, and takes 58.6 days to rotate once on its axis !That's 1,406 hours .
The Sun rotates on its axis once every 25.05 (Earth) days.
The earth's moon rotates on its axis in exactly the same period of time required for it to revolve around the earth once in its orbit ... 27.32 days.