Confused yet?
The first day of spring, summer, fall, or winter isn’t as fixed as you might think. In fact, there are two widely accepted calendars: the (based on Earth’s orbit around the sun) and the meteorological (based on annual temperature cycles and the calendar for simpler record-keeping). when does each season start
Furthermore, because the Earth’s orbit isn’t a perfect circle (it’s an ellipse) and the calendar doesn't perfectly align with the solar year, the dates of these events wobble. They can shift by a day or two depending on leap years and orbital mechanics. Confused yet
Seasons are reversed south of the equator. When the Northern Hemisphere tilts toward the Sun, the Southern Hemisphere tilts away. Meteorological Versus Astronomical Seasons | News Furthermore, because the Earth’s orbit isn’t a perfect
Climate change has violently disrupted this calendar. In many parts of the Northern Hemisphere, "biological spring" is arriving weeks earlier than it did fifty years ago. The cherry blossoms in Washington D.C. or Japan are blooming earlier, pushing their own timeline regardless of what the astronomical charts or meteorological calendars say.
This is due to .
The next time someone says, "I can't believe it's winter already," you can smile and ask: "Do you mean the meteorological winter that started three weeks ago, the astronomical winter that starts tomorrow, or the thermal winter that won't peak until late January?"