The National Observatory of New Zealand
(Date September 14. For immediate release)
The Southern Hemisphere Spring Equinox occurs on September 23 at 09:51 pm. Technically this is one of the two points on the celestial sphere where the celestial equator intersects the ecliptic, but put simply, it is when the Sun returns from the Northern Hemisphere back into the Southern Hemisphere.
Brian Carter, Senior Astronomer at Carter Observatory says, “at this time of year, the length of the day is increasing by about 3 minutes a day, which is the greatest increase in the year.”