Length of day increases from the equator towards the South Pole in the Southern Hemisphere in December (around the summer solstice there), but decreases towards the North Pole in the Northern Hemisphere at the time of the northern winter solstice. Light pollution can actually be solved immediately by turning off your lights, and those changes can be global,” Ms Ogg said.The study will also look at the effects of COVID-19 lockdowns on heavily light-polluted places like big capital cities with lots of housing developments.“With less activity happening around the COVID-19 lockdowns and quarantine, I’ve certainly noticed that the stars seem to be a bit clearer,” UNSW Astrophysicist Kirsten Banks told AAP.“Wherever you are, you’ll be able to see at least a few hundred stars. Australian star-gazers will help shine a light on the issue of light pollution by observing the sky during the winter solstice today.Sunday is the winter solstice, which is the shortest day of the year, with the sun rising about 7am and setting around 5pm across the east of the country.From now the days will gradually start getting longer.On Sunday, Australians are being asked to look at specific constellations, to understand and map the levels of light pollution in cities and regions.“The activity determines what layer of light pollution people are looking through to see the Southern Cross, and that gives us an on-the-ground map of what’s happening with light pollution,” Australasian Dark Sky Alliance CEO Marnie Ogg said.Observers will record their findings in an international online database.Data about light pollution in the southern hemisphere is currently dwarfed by the amount of data collected in the northern hemisphere“Up until April, we virtually had no real sources of scientific data in the southern hemisphere for light pollution,” Ms Ogg said.Scientists hope the activity will lift the lid on the effects of light pollution in Australia and inform people about the disruption it causes to humans and animals.“Nocturnal animals are suffering because they never really get the darkness they need. Insects and spiders are completely changing their patterns and even perfunctory systems such as pollination are being dramatically changed,” Ms Ogg said.Research suggests artificial lights have negative health effects on humans, causing sleep disruption and an increased risk of developing certain diseases and cancers.“Melatonin cycles are being disrupted and our bodies become unaware if it’s day time or night time.”“This is something that you can make a difference with immediately. The shortest day of 2020 is just around the corner, with the winter solstice taking place in Australia in one week's time. The winter solstice, hiemal solstice or hibernal solstice, also known as midwinter, occurs when one of the Earth's poles has its maximum tilt away from the Sun. It’s the day that has the least daylight hours of any other in the year. Even in Sydney and Melbourne, you can still see some of the brightest stars in the night sky,” she said.Organisers says the winter solstice event will also be an attempt to break the world record for ‘Most users to take an online environmental sustainability lesson in 24 hours’ on the night.The Anzac Bridge is seen while two seagulls perch on a rail at the Fish Markets in Sydney during the winter solstice in Sydney, 2019.A woman holds an umbrella as she stands in front of the Sydney Harbour Bridge during the winter solstice in 2019.How Aussies can watch the rare ‘ring of fire’ solar eclipseStudy calculates there could be 36 intelligent civilisations in our galaxyScientists believe there are at least 36 communicating intelligent civilisations in the Milky Way.Pregnant woman's baby 'ripped from her belly at fake baby shower'What the AFL will get in return for a Queensland grand finalToddler lucky to be alive after getting object lodged in nose From now the days will gradually start getting longer. For other uses, see Length of the day near the northern winter solsticeLength of the day near the northern winter solstice Sunrise, sunset and daylight hours An interesting idiosyncrasy relating to the summer solstice is that it does not feature the day with the earliest sunrise and latest sunset as is commonly expected.


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