1 year
30,685 Earth days, about 84 Earth years
It takes the Earth approximately 365.25 days to make a full revolution around the sun, which is why we have a leap year every four years to account for the extra quarter day.
A lunar cycle is the time it takes for the moon to make a full revolution around the Earth. It takes about 29.5 days.
It takes mars twice as long to make a full revolution around the sun than it takes earth.
A full revolution around Earth takes about 27 1/2 days. A full cycle (from full moon to full moon for example) takes a bit longer: 29 1/2 days.
The moon's revolution around the Earth takes approximately 27.3 days, which is also known as its sidereal period. This is the time it takes for the moon to complete one full orbit around the Earth.
Phases of the moon are caused by the revolution of the moon around the Earth and the revolution of the Earth around the sun. As long as the moon revolves around the Earth as it does, the lunar cycle from full to new to full again will take about 29½ days. We will be having about twelve and a third moon cycles every year until these facts change.
When the Earth makes one full revolution around the sun, it completes a year, which is about 365.25 days long. This revolution is what causes the changing of seasons as different parts of the Earth receive varying amounts of sunlight throughout the year.
one day
It takes Mercury 1407.6 Earth hours to make one full rotation around its axis.
According to the International Astronomical Units, a Julian year is 31,557,600 seconds long.