Orbit: Earth's Extraordinary Journey Episode guide
3/3 Helen Czerski shows how the earth's angle of tilt creates the most extreme weather.
First broadcast: 18 Mar 2012
2/3 Kate Humble gets closer to the Sun than she has ever been before.
First broadcast: 11 Mar 2012
1/3 Following the Earth's orbit from July to the December solstice.
First broadcast: 04 Mar 2012