Posted by ryan
Wednesday 21st March 2012
Today is the first day of Spring and the Sun is now spending more time above the horizon than below. So I thought I would take the opportunity to say hello and wish you all well as we tilt towards the Sun once more.
The Vernal Equinox and the Autumnal Equinox are the only two days when, if you were standing on the Equator, the Sun would pass directly overhead. If you were up on the North Pole then the Sun would be skimming the horizon, full circle, beginning an uninterrupted 6 month day. Since 1582 we use the Gregorian Calendar (from Pope Gregory X111) which gives us the 365.25 days as one full year. The actual 'tropical' year is 365.24219 days (time it takes for the Earth to complete one exact orbit around the Sun). This meant that even though t…