For me it is the spring equinox and I will be happy to have the warmer temperatures we will (or should have) for the next few months.
I like to take the winter season in stride but I have to say this one seemed long and it was cold, much below average on both max and min temperatures. Plenty of snow too, but closer to average amounts it just never went away.
Those in the southern hemisphere this is the autumn equinox and shorter days are ahead.
The time of the equinox is 21:58 UTC / 17:58 EDT
The video is from the Kurdistan Planetarium