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Ben Domensino, 26 Sep 2023, 3:49 AM UTC

Days now longer than nights in Australia for the rest of 2023

Days now longer than nights in Australia for the rest of 2023

Australia has passed the spring equinox and will now have more daylight than darkness for the rest of the year.

The Southern Hemisphere’s spring equinox occurred on the weekend, marking the moment the sun was positioned directly above the Earth’s equator. Following Saturday’s equinox, the sun’s position relative to Earth will now be above the Southern Hemisphere for the next six months.

Image: Orientation of the Earth relative to the Sun at the spring equinox.

One captivating way to observe the equinox is to view satellite images of Earth to see the solar terminator (line between day and night) running perpendicular to the equator. This orientation of the terminator is what makes day and night roughly equal in length across the planet on the date of the equinox.

Image: Visible satellite image of Earth captured by the Himawari-9 satellite one hour after the 2023 September equinox. Source: RAMMB/CIRA

Now that the equinox has passed, the Southern Hemisphere will be tilted towards the Sun more than the Northern Hemisphere for the rest of 2023. This will make days are longer than nights in Australia, with days gradually growing longer, and nights getting shorter, until the summer solstice in late-December.

This year’s spring equinox occurred one week before the start of Daylight Saving Time (DST), which kicks off in NSW, Vic, SA, Tas, the ACT and Norfolk Island at 2am this coming Sunday. For these states and territories, days won’t only last longer but will soon end a little later too.

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