Why Isn't Summer June 21st this Year?

I've been asked many times over the past week... "Why isn't summer June 21st this year?".   There are a lot of different reasons why that is, but I'll just break it down into a few different things.

First- Seasons occur because of the tilt of the Earth in its orbit around the Sun.  The Earth's tilted on a 23.45 degree axis and therefore is not straight up and down.  It is the tilt of the Earth that causes our seasons to change... and that is why while North America is enjoying Summer in June, places like South America are in winter.

Second- Most people know there are 365 days in a year.  However, it is actually 365.242 , just about 1/4 of a day per year... which adds up over time.. into a day and that is why every 4 years, there is a Leap Year in February.  (1/4 of a day times 4 years, equals one day)

While the Winter and Summer Solstices are commonly on the 21st of December and June respectively... it doesn't always happen due to the length of time in one year, a 23.45 degree tilt and an elliptical orbit.

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