Each of our days are measured in the 24 hours it takes for the Earth to rotate on its axis. A year is the time the Earth takes to revolve around the Sun, about 365 and a quarter days. That’s why every four years an extra day at the end of February is added – well that’s not quite true because if the year is not divisible by 400 it’s missed, but we certainly added an extra day in 2008. This calendar has been in operation since 1752 and it was then that an adjustment of 11 days had to be made to the old calendar to correct an error in its calculation. This confused some people who thought their life on Earth was being cut short and others thought they were paying their landlords rent for days they’d never had! Yes, our life on Earth is spent in days, and each is important because we don’t know how many we have left.