Perihelion occurred on Jan. 4. What exactly is that, you might ask?
Perihelion is the point at which an orbiting body is at its closest point to the sun.Earth’s elliptical orbitIt is the result of the elliptical orbit Earth has around the sun.All planets, and even comets and asteroids, have elliptical orbits around our large sun.Perihelion always occurs in early January, but it is not on one specific date as the Julian calendar does line up exactly with Earth’s orbit .At perihelion, Earth is a close 91 million miles away from the sun.
Our seasons are not governed by the location of Earth relative to the sun. It’s governed by the tilt of the Earth.In January, the northern hemisphere is tilted away from the sun. This creates winter. Because of the seasonal lag that occurs, January is normally the coldest month as the reduction of sunlight from the sun creates colder conditions.We now begin to orbit further away from the sun as the weeks and months progress.
There is a day when the Earth will be furthest away from the sun. This is called aphelion and it occurs in July.Again, because of the tilt of the Earth, July is normally one of the warmest months despite the further distance from the sun. So we start the year the closest to the sun we will be, despite being in the heart of the winter season.
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