2016 Â 2017 2018 Â 2019 Â 2020 Â 2021Â 2022Â 2023Â 2024Â 2025Â 2026 ….
- calendar year is roughly the time; Earth takes to travel once around our Sun – 365 days.
- our Earth actually takes 365.24219 (365Â¼)Â days to orbit our Sun -this is called a solar year.
- compensating for the missing 0.242 days (Â¼Â day) -adds an extra day in February every fourth year – this is called leap year. (Â¼ day +Â Â¼day +Â Â¼day +Â Â¼day = 1 day extra every four years)
- when measured by the stars – not our Sun, Earth takes 365.25636 days to go round our Sun – this is because our Sun also moves a little, relative to the stars; this is called sidereal year.
Measuring the stars
Earth’s perihelion and aphelion
- our Earth’s perihelion is the day its orbit brings it closest to the Sun – 3rd January.
- our Earth’s aphelion is the day it is furthest from the Sun – 4th July.
The Orbit of the Planets
– the planet with the shortest year is Mercury around the Sun in just 88 days.
– the second closest planet to our Sun, Venus completes a single orbit once ever 224.7 days.
– it takes 365.2564 solar days to complete a single orbit of the Sun.
– which is why we add an extra day to the calendar every four years (leap year).
– one of the highest eccentricities of any planet in the Solar System.
– ranging from 128,437,425 miles at perihelion and 154,845,701 miles at aphelion
– takes the equivalent of 687 (Earth) days or 1.8 calendar year to complete a single orbit around the Sun.
– another interesting case
– whereas the gas giant only takes 9 hours 55 minutes and 30 seconds to rotate once on its axis.
– also takes alson 11.8618Â Earth years to complete an orbit around the Sun.
– much like its fellow gas giant Jupiter, Saturn takes it time completing a single orbit of the Sun.
– rotates on its axis very rapidly.
– a year on the planet lasts the equivalent of 10,759 Earth days (or about 29Â½ years).
– since it only takes 10 hours, and 33 minutes to complete a single rotation on its axis.
– the gas/ice giant takes about 84 Earth years (orÂ 30,688.5 Earth days) to rotate once around the Sun.
– since the planet takes 17 hours, 14 minutes and 24 seconds to complete a single rotation on its axis.
– a year on Uranus lasts 42,718Â Uranian days.
– the planet with the longest year
– takes 164.8 years to orbit the Sun.
– lasting the equivalent of 164.8 years (or 60,182 Earth days).
– since Neptune also takes comparatively little time to rotate once on its axis (16 hours, 6 minutes and 36 seconds).
– a single year lasts a staggering 89,666Â Neptunian days.