This was my question too! But the internet is full of off topic questions! Im getting angry....
Day and night are a result of the earth's rotation on its axis. As the earth turns, different parts are facing towards or away from the sun. It takes 24 hours to complete a rotation: thus, a day is 24 hours long.
90 hours would be 3.75 earth days.
6.4 days * 24 hours/day = 153.6 hours
In the typical year there are 8,760 hours. In a leap year, there are 8,784 hours.
Neptune is actually the farthest planet from the Sun because Neptune's orbit is oval shaped. It takes Neptune 165 years to orbit the Sun. So each season on Neptune lasts for 40 years. ACTUALLY it takes neptune 164 years to revolve and 0.67 earth days to rotate
Because it only takes 8 minutes for sunlight to reach Earth, but it takes 4 hours to reach Neptune.
The rotation of the planet Neptune is much faster than Earth's. It completes a rotational "day" in about 16 Earth hours. So in an Earth year (365.25 Earth days), Neptune completes about 544 Neptune days. In a Neptune year, there are about 89,666 Neptune days.
The time would be T= d/c where d is the distance between Earth and Neptune and c is the speed of light.
The rotation period of Neptune is 16.1 earth hours.
Neptune has an average distance from the Sun of 2.8 billion miles and the earth is 0.09 billion miles from the sun so it is 2.71 billion miles from the earth. Light travels at 186,000 miles per second. So 2.71 x 109 divided by 186,000 = 14570 seconds = 4.05 hours = 4.62 x 10-4 years.
At the speed of light it takes 4 hours 11 minutes and 27 seconds.
16 hours or 0.67125 earth days
A day on Neptune is 16 hours, 6 minutes and 36 seconds. A year on Neptune is 164.8 Earth years.
Neptune is in the same solar system as the earth. It is about 2.7 billion miles from earth. It takes like about four hours and two minutes to extend from the earth to Neptune. That would make Neptune about 0.00036782 light years from earth.
A year on Neptune is 164.79 Earth daysA day on Neptune is 16 h 6 min 36 s
16 Earth hours
There are about 0.6713 Earth days or about 16 hours, 6 minutes, 36 seconds in a day on Neptune. (see related link on Neptune)16.11 Earth hours