Kate Humble: 'As close to the Sun as I'll ever be'
That day is known as perihelion. Despite the Sun being 3.1 million miles (5 million km) closer to the Earth on perihelion than in July, the Earth's tilt means it is still winter in the northern hemisphere.
See Orbit: Earth's Extraordinary Journey on BBC2 at 21:00 on Sunday March 11 and afterwards on the BBC iPlayer.
11 Mar 2012
- From the section Science & Environment