Did you feel it on Tuesday — that instant when spring officially commenced around lunchtime? At 12:15 p.m., to be precise. Spring begins when the vernal equinox occurs, which is that moment when the hours of daylight, which have been increasing for the last three months, reach a balance with the hours of darkness: Twelve hours of day, and 12 of night.
Since our days will continue to lengthen for another three months, the arrival of spring marks the point at which we begin to enjoy more hours of daylight than of darkness each day. This is because the Earth’s orientation relative to the sun is changing so that the northern hemisphere is tilted more towards the sun. That means that we not only get longer days, we also receive more intense and more direct sunshine. That’s pretty much why it gets warmer here during the summer.
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