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Equal Parts Day and Night?

Equal Parts Day and Night?

March 20, 2019 05:45 PM

Today is the start of Spring and by definition it means the sun is angled directly overhead of the equator.  This means equal parts of day and night.... Equinox.  So how come the sunrise/sunset times say differently.  We're already seeing 12 hours and 10 minutes of sunshine each day.  So the equinox should have happened a couple days ago, right?  No.

It's really a simple explaination.  When talking the Equinox, the is measuring from the center of the sun.  But that's now how we define sunrise and sunset.  Those are defined by the first and last instant the sun touches the horizon.  Therefore... we have a few minutes that pass before the sun's center rises above the horizon and dips back below accounting for that extra 10 minutes.  

Days will remain longer than nights until the later stages of September when we hit the next Equinox or... start of Fall.

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