Spring is officially upon us. For most of the country, this season may end up on the warm side.
The reason we see more than 12 hours of daylight on the equinox happens for two reasons. One is how we define the term “sunrise” and “sunset” to measure the length of a day. The other is something called “atmospheric refraction.”Anyone who has photographed a stunning sunrise or sunset has surely noticed that the sun looks like a huge, lumbering disk when it’s near the horizon.
“Sunrise is defined as the moment the upper limb of the sun pokes over the horizon, while sunset occurs when the last glimmers of sunlight disappear below the horizon,”. “Because we’re taking the first-up, last-down approach to defining day length, rather than tracking when a single point on the sun is above the horizon, our day is a couple of minutes longer than 12 hours.”, or bend, the sun’s light, allowing us to see the sun even when it’s technically below the horizon.
In the Northern Hemisphere, the spring equinox marks the time of year when we gain the greatest amount of daylight. For the next three months, you’ll also notice the sun rise and set a bit farther to the north as it takes aWhile the days have been getting longer since the winter solstice, we experience the greatest increase in daylight around the spring equinox.
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