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The Astronomical Society of Jeddah confirmed that the spring equinox was held on Thursday, March 21, 2019 at 12:58 on the first day of spring.
The Company said that the spring equinox represents a point of Earth's orbit around the sun and is also a sign of when the sun "crosses" apparently the celestial equator, moving from the south half to the north half of the celestial dome.
"That day, the sun will be vertical to the equator, heat and light will be evenly distributed over the hemispheres, while the regions north and south of the equatorial region will receive an oblique sun that will diminish 90 degrees on the equator to zero at the poles, degree.
"In general, the duration of the day is supposed to be 12 hours and the night 12 hours, but that does not happen exactly for two reasons: first, the sun is a circular disk, not a bright point like distant stars ,
She explained that the second reason is the refraction of the atmosphere, the atmosphere of the Earth, such as a lens or a publication intended to raise the sun by 0.5 degree compared to its real geometric position at the approach of the sun, and a chance that the sun's diameter is angular about 0.5 degree, which means that the sun is visible The horizon is actually at the # 39; horizon.
"On the day of the spring equinox, the observer will observe that the sun rises from the point is original and returns to the original western point.It will then be clear that the dawn get up early and the sun goes down late, and observe every day the path of the sun visible in the sky, "he said.
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