These mind-boggling numbers and just what our orbit around the sun means to us is explored and explained by Kate Humble and Dr Helen Czerski, who follow the Earth's voyage around the sun for one complete orbit.
In the first of three episodes Kate and Helen travel from July to the December solstice, experiencing spectacular weather and the largest tides on Earth. To show how the Earth's orbit affects our lives, Helen jumps out of an plane and Kate briefly becomes the fastest driver on Earth.