Orbit: Earth's Extraordinary Journey

In this first episode they travel from July to the December solstice, experiencing spectacular weather and the largest tides on Earth. To show how the Earths orbit affects our lives, Helen jumps out of an aeroplane and Kate briefly becomes the fastest driver on Earth.

In this final episode we complete our journey, travelling back from the March equinox to the end of June. Kate Humble is in the Arctic at a place where spring arrives with a bang, whilst Helen Czerski chases a tornado to show how the earths angle of tilt creates the most extreme weather on earth.