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The Earth's Orbit. It takes roughly 365 days for the Earth to go around the Sun once. This means that the Earth is rushing through space around the Sun at a rate of about 67,000 miles per hour! The time it takes for the Earth to go around the Sun one full time is what we call a year.
A year is defined as the time it takes a planet to complete one revolution of the Sun, for Earth this is just over 365 days. This is also known as the orbital period. Unsurprisingly the the length of each planetâs year correlates with its distance from the Sun as seen in the graph above.The precise amount of time in Earth days it takes for each planet to complete its orbit can be seen below. Mercury: 87.97 days (0.2 years).his is also known as the orbital period. Unsurprisingly the the length of each planetâs year correlates with its distance from the Sun as seen in the graph above. The precise amount of time in Earth days it takes for each planet to complete its orbit can be seen below. Mercury: 87.97 days (0.2 years).