Since long ago, people have determined time by looking at the skies and the astronomical events that occur. You already know that the rotation of the earth defines day and night while the revolution of the earth around the sun causes different seasons and also determines a “year”. However, with the advances in technology, scientists have developed the definition of a year and accurately designated it as Tropical Year or the Solar Year.

Photo by: S.fonsi Creative Commons Equinox literally means equal and this is the time of the year when the sun is over the equator which means that there is an equal length of time for night and day. This usually occurs twice a year, once in March and once in September. The equinox occurring in March or during the spring time is termed the vernal equinox (in the Northern Hemisphere) while September is termed the autumnal equinox. Vernal equinox usually [...]