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Kate Humble and Dr Helen Czerski follow the Earth's voyage around the sun for one complete orbit, travelling first from July to the December solstice and showing its effect.

Right now you're hurtling around the sun at 64,000 miles an hour (100,000 kms an hour). In the next year you'll travel 584 million miles, to end up back where you started.

Presenters Kate Humble and Dr Helen Czerski follow the Earth's voyage around the sun for one complete orbit, to witness the astonishing consequences this journey has for us all.

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 Earth's orbit affects our lives, Helen jumps out of an aeroplane and Kate briefly becomes the fastest driver on Earth.

First shown: 9pm 4 Mar 2012
Available for 14 days Duration 60 mins