Orbit: Earth's Extraordinary Journey — S01E02 — Spin

00:00:11 All of us, every day of our lives, are on the move.

00:02:13 to the spring equinox in March.

00:04:29 than it will be in July.

00:07:03 by up to 50%, far more than perihelion increases it,

00:09:42 This isn't the only glacier in this region, not by a long way.

00:12:03 That's because water has an important characteristic.

00:14:30 Now, down here, we can see what happened to this kind of stone after the impact.

00:17:19 The Vikings believed them to be the reflections of dead maidens.

00:20:06 Too far away, and it would freeze.

00:22:40 so the air is laden with vapour, the gaseous form of water.

00:25:14 the land would be a dry and barren desert.

00:27:32 As it rises over Upstate New York, it forms clouds.

00:29:50 At night, the storm finally arrives.

00:32:34 because in January, winter is still getting colder,

00:34:50 There's something curious about the way winter peaks towards the end of January.

00:37:03 The season starts towards the end of January.

00:39:22 There's evidence in the most unexpected places.

00:42:37 In other words, they didn't form in the ocean.

00:45:23 it's summer temperatures which are important in starting ice ages.

00:47:35 The first is the angle of the Earth's tilt.

00:50:23 Kulusuk is surrounded by the Arctic Ocean.

00:53:34 Gio tells me that only days ago,

00:55:46 Greenland sea ice is at its maximum extent at this time of year, in March.

00:58:23 ..travelling from the equinox back to where we started - the summer solstice.