how long does it take for planet neptune to rotate around the sun?

Answer 1

84 years.

But planets are said to revolve around the Sun, not rotate. Rotation refers to daily rotation on the axis while revolution refers to the orbital motion around the Sun. The Neptune rotates on its axis once every 18 hours and revolves around the Sun once every 84 years.

Answer 2

Conservation of angular momentum. The Earth (and the different planets interior the image voltaic gadget) formed from a rotating cloud of gas and dirt. the certainly fee of rotation has been tormented by means of historic encounters as a results of fact that element. Rotation speed might have extra advantageous as mass became pulled in from an accretion disk. it relatively is recommended that the Earth gained the Moon whilst yet another planetary physique crashed into the nascent Earth early interior the historic previous of the image voltaic gadget and this form of collision might have affected the rotation of the Earth. as a results of fact the advent of the Earth-Moon gadget the rotation fee of the two bodies has been tormented by means of tidal interactions between the two. frequently this has brought about a gradual help interior the rotation fee of the Earth. Earthquakes and different geological interest reason redistributions of mass interior the Earth which even have small outcomes on the earth's rotation.