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"If there was no tilt to the Earth, it would be the equinox all year round," Dr Brett Carter, a space weather expert at RMIT University, said.
In an Australian summer, the southern hemisphere is tilted towards the Sun, and in our winter it's tilted away.īut at two points of the year - the equinoxes in March and September - the Earth's axis is side on, so no part of the planet is tilted towards or away from the Sun. This is what causes the seasons in the temperate parts of the world. As it travels around the Sun, different parts of the planet are tilted more directly at the Sun. It's the point at which the Sun appears to traverse the equator from the Earth's perspective, shining equal light on both hemispheres. If you were standing at the geographic equator and looked up during an equinox, you'd see the Sun pass directly overhead.
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If you're in a regional area, the internet might be patchy, too. Day and night are 12 hours each around the globe today - except at the poles - as the Earth reaches equinox.īut in the fortnight after the autumnal equinox - and the fortnight before the spring equinox - in the southern hemisphere, you may notice that your radio or TV broadcast briefly drops out.