Why is there not exactly 12 hours of daylight on Equinox?

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Why is there not exactly 12 hours of daylight on Equinox?
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Spring has sprung!

We have been gaining daylight rapidly over the last few weeks. The sun came up around 7:31 a.m. on Sunday and will set around 7:40 p.m. in Cleveland.

That is about 12 hours and 8 minutes of daylight. Interestingly, the date when there were nearly equal parts day and night happened a few days before the vernal equinox. The specific dates for this occurrence are different for different latitudes. For our latitude, this happened on St. Patrick's Day with 12 hours and 34 seconds of daylight.

At the equator, the sun is directly overhead at noon on these two equinoxes. The"nearly" equal hours of day and night are due to the refraction of sunlight or bending of the light's rays that causes the sun to appear above the horizon when the actual position of the sun is below the horizon. Additionally, the days become a little longer at the higher latitudes because it takes the sun longer to rise and set.

For observers within a couple of degrees of the equator, the period from sunrise to sunset is always several minutes longer than the night. At higher latitudes in the Northern Hemisphere, the date of equal day and night occurs before the March equinox and daytime continues to be longer than nighttime until after a few days after the September equinox.

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