The winter solstice occurs this week on the 21st of December. The sun will rise about 7:47am and will set just a little more than eight hours later at 4:11pm. That leaves a lot of time in the dark but the good news is the days will start getting longer again. I learned something about the length of time between the solstice and the spring equinox in an article by Bruce McClure on Earth Sky and thought I would share it with you.
This solstice marks the beginning of the winter season in the Northern Hemisphere, and the start of the summer season in the Southern Hemisphere. And, no matter where you are on Earth, it marks the beginning of your shortest season.
By season, we mean the time between a solstice and an equinox, or vice versa. The upcoming season – between the December solstice and March equinox – is a touch shy of 89 days.
Contrast the number of days of the upcoming season with that of the longest season, a Northern Hemisphere summer or Southern Hemisphere winter. The longest season as measured from the June solstice to the September equinox lasts 93.65 days.
Why is the upcoming season nearly 5 days shorter? Every year in early January, the Earth swings closest to the sun for the year. Because Earth is nearest the sun at this time, Earth moves most swiftly in its orbit. That’s why a Northern Hemisphere winter or Southern Hemisphere summer is the shortest of the four seasons.
On the other hand, in early July, Earth is farthest from the sun and moving most slowly in its orbit.
Lengths of the astronomical seasons:
December solstice to March equinox: 88.99 days
March equinox to June solstice: 92.76 days
June solstice to September equinox: 93.65 days
September equinox to December solstice: 89.84 days