when does autumn start in the northern hemisphere
Autumn In North America, autumn is usually considered to start with the September equinox (21 to 24 September)[5] and end with the winter solstice (21 or 22 December).[6] Popular culture in North America associates Labor Day, the first Monday in September, as the end of summer and the start of autumn; certain summer traditions, such as wearing white, are discouraged after that date.[7] As daytime and nighttime temperatures decrease, trees shed their leaves.[8] In traditional East Asian solar term, autumn starts on or around 8 August and ends on or about 7 November. In Ireland, the autumn months according to the national meteorological service, Met Éireann, are September, October and November.[9] However, according to the Irish Calendar, which is based on ancient Gaelic traditions, autumn lasts throughout the months of August, September and October, or possibly a few days later, depending on tradition[citation needed]. In Australia and New Zealand, autumn officially begins on 1 March and ends on 31 May.[10]
Alonso Álvarez de Pineda
Paris Peace Accords
Time Earth is split up into a number of time zones. Most time zones are exactly one hour apart, and by convention compute their local time as an offset from GMT. For example, time zones at sea are based on GMT. In many locations (but not at sea) these offsets vary twice yearly due to daylight saving time transitions.