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The 2018 vernal equinox has arrived — here’s what it is and how it works

The vernal equinox of 2018 passed at 3.15am, AEDT. Earth’s rotation does not cause equinoxes. Equinoxes occur when Earth’s tilted axis is perpendicular to the sun’s rays. During an equinox at Earth’s equator, the sun appears almost directly overhead. The year’s vernal equinox, also called the March or – in […]
The 2018 vernal equinox has arrived  —  here’s what it is and how it works