solstice
The scientific name for the first day of spring is the vernal equinox. It occurs around March 21st and marks the official start of spring in the northern hemisphere when daylight and nighttime hours are approximately equal.
The winter solstice, which usually occurs around December 21.
Autumnal equinox
summer solstice
I assume you are referring to the Winter Solstice, which occurs on December 21st in the Northern Hemisphere.
The first day of winter is never in November.
What is the first day of winter in the southern hemisphere
December 21/22 is the official first day of winter
In North America, the first day of fall is considered to be on September's equinox. Every year, there is another equinox around March 20.
The first day of spring is an equinox, as is the first day of autumn. Solstices occur on the first day of winter and the first day of summer.
December 21 is the official day of winter.
December. The first day of winter is the solstice, usually around the 21st of the month.