# In one Earth year how many revolutions will Mercury complete compared with Neptune?The differences in their distance from the sun would make the years look very different.

samhouston | Certified Educator

One Earth year is equal to 365.26 earth days.

One Mercury year is equal to 87.96 earth days.

One Neptune year is equal to 164.81 earth years.

First, change 164.81 earth years into earth days so that we are dealing with the same unit of measurement.

If one Earth year = 365.26 earth days and one Neptune year = 164.81 earth years, then 164.81 * 365.26 = 60,198.5006 earth days.

One Earth year is equal to 365.26 earth days.

One Mercury year is equal to 87.96 earth days.

One Neptune year is equal to 60,198.5006 earth days.

Earth year compared to Mercury year:

Earth year / Mercury year

365.26 / 87.96 = 4.15257 revolutions

Mercury will complete 4.15257 revolutions in one earth year.

Earth year compared to Neptune year:

Earth year / Neptune year

365.26 / 60,198.5006 = 0.00607 revolutions

Neptune will complete 0.00607 revolutions in one earth year.

Mercury revolutions compared to Neptune revolutions:

4.15257 / 0.00607 = 684.1167 revolutions

Mercury will complete 684.1167 revolutions in the time it takes Neptune to complete 1 revolution.

I have attached a link providing planetary year lengths.