While spinning daily on its own axis, the earth also orbits the sun (again in an anti-clockwise direction) on a path which is slightly elliptical rather than completely circular. It pursues this orbit at truly breakneck speed, travelling as far along it in an hour - 66,600 miles - as the average motorist will drive in six years. To bring the calculations down in scale, this means that we are hurtling through space much faster than any bullet, at the rate of 18.5 miles every second. In the time that it has taken you to read this paragraph, we have voyaged about 550 miles farther along earth's path around the sun.3