On July 5, Earth is at aphelion, or farthest point from the Sun, on its yearly orbit. At aphelion Earth will be 94,510,539 million miles (152, 099,968 million km) from the Sun. In the northern hemisphere we are now experiencing summer. In January however, Earth was at Perihelion, its closest point to the Sun, being only 91,404,095 million miles (147,100,632 million km) away. The seasons are caused not by how close Earth is to the Sun, but by which hemisphere is tilted towards it. In July the northern hemisphere is tilted towards the Sun, while in January when Earth is closest to the Sun, the northern hemisphere is tilted away from it.
www.theramblingastronomer.co.uk
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