How many times Earth orbited the sun since its birth

  Earth orbiting calculations around the sun

We worked out how many trips each of the solar system's eight planets has taken around the sun over the past 4.6 billion years. The orbital period of the solar system's planets varies widely. When you are standing on Earth's surface, it's easy to forget that our planet is hurtling around the sun at more than 67,000 mph (107,800 km/h). And it's even easier to forget that there are seven other planets also making their way around our home star at similar breakneck speeds, or that all eight have been ceaselessly circling the solar system for billions of years. But what might really blow your mind is finding out how many trips around the sun each planet has taken since their birth. This may seem like a tricky thing to calculate, but because the planets' orbits have remained largely unaltered for most of their existence, all it takes is a bit of basic math.

The solar system was born around 4.6 billion years ago, when the sun began to form from a cloud of dust left behind by prior stellar explosions. Around 4.59 billion years ago, the giant planets — Jupiter, Saturn, Uranus and Neptune — were born. And around 4.5 billion years ago, the smaller, rocky planets — Mercury, Venus, Earth and Mars — took shape as per the The Planetary Society. But when the planets were born, their orbits around the sun were not the same as they are today (especially those of the giant planets). For around 100 million years after the first planets formed, there was a "dynamical instability" among them, which resulted in a gravitational tug-of-war between these large bodies and caused the rest of the outer solar system's planetary material, and even some emerging proto planets, to be catapulted out of the solar system. However, once all of the planets had emerged and finished jostling with one another for their positions, they settled into consistent, stable orbits which haven't changed much since.

For 98% to 99% of the solar system's lifetime, the planets' orbits have been nice and stable. As a result, you can use the planets' current orbital dynamics to make a pretty accurate guess at how many trips they have made around the sun. For example for earth, Our planet takes a year to orbit the sun and has existed for 4.5 billion years, so it has taken roughly 4.5 billion trips around the solar system. However, the number of total orbits varies greatly among the other planets because their years are either shorter or longer than Earth's. Earth has made roughly 4.5 billion trips around the sun since it was created.

Mercury, the closest planet to the sun, takes only 88 days (or roughly 0.24 years, based on a year with 365.25 days) to travel around the sun once. So, over the past 4.5 billion years, it has completed around 18.7 billion solar orbits. But Neptune, the farthest planet from the sun, takes around 60,190 days (or 164.7 years) to complete an orbit, which means it has managed only about 27.9 million trips around the sun during its 4.59 billion years of existence.