The Celtic tradition broke the year into the light half which starts half way between Equinox and Solstice on May 1st (closest date) while the dark half began on November 1st know as Samhain which morphed into Halloween through American and Christian influences.

https://stairnaheireann.net/2017/04/...ainebeltane-2/

For those who live in Northern latitudes, this division makes more sense than variable weather conditions which change from year to year. It also reflects an accurate experience where total polar night has set in after a 6 week period of twilight.

So the old cultures who lived as a pastoral society had a closer feeling for the seasons due to their style of living and their livestock or fishing cycles. This was being spiritual and something this society could badly do with.