A year – astronomically – is a spin of a celestial object around a center of gravity. In our – Earthly – case, a year is, of course, a spin around the Sun.
As we yearn for stability and balance in our lives, we are zipping around the Sun at an orbital speed of 30 kilometers per second (that’s 108,000 kilometers per hour) – and not down some well-paved straight line, but on a perpetual curve, without any chance of ever getting off this mind-boggling ride!
Ponder this as well: a straight line is but a geometrical abstraction. We live in the world of tremendous centripetal/ego-centric forces and inevitable curvatures.