when does spring start in the southern hemisphere
Like the day and the year, the seasons are based on astronomical occurrences. The seasons, however, are related only to the year itself and not to any other units of time. In the Northern Hemisphere, spring begins about March 21, summer about June 21, autumn about September 23, and winter about December 22. In the Southern Hemisphere, it is autumn that begins in March and spring that begins in September.