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May 17, 2021

North Coast best place to view lunar trifecta

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A super red blue moon event will take place on 31 January. photo: AOL.com

North Coast stargazers will be in for a treat on 31 January when a once-in-lifetime lunar event takes place.

That evening a blue moon, a blood moon and a supermoon will all converge on the same night, providing a lunar trifecta, and the NSW North Coast and Gold Coast will be the best places in the world to view it.

Southern Cross University geographer Professor Bill Boyd said the extremely unusual occurrence would be the first ‘super red blue moon’ for at least 150 years.

‘The title ‘super red blue moon’ sounds a bit peculiar, but it describes an event where three separate lunar conditions come together simultaneously,” said Professor Boyd.

‘Each happens on its own time cycle, but this year they all happen at the same time. This is an extremely unusual occurrence – it will be unlikely for all three celestial events to converge again within the next century.’

Professor Boyd said a supermoon happens when the moon is at the closest point on its orbit around the Earth, some 25,000 km closer than on average. It appears 14 per cent larger than usual and 30 per cent brighter. This happens every 14 months or so.

‘Meanwhile, a lunar eclipse happens when the sun, the Earth and the moon are completely aligned, so that the moon travels through the Earth’s shadow. It occurs two to four times a year, though not usually a full eclipse.

‘Indeed, the January 31 lunar eclipse is the first total eclipse in 150 years.’

Professor Boyd said as the moon passes through the earth’s shadow, people often assume it will go completely dark.

However, some of the sunlight entering the Earth’s atmosphere, notably the red spectrum, is scattered in a way that gently illuminates the moon.

‘This gives the moon its red glow,” he said, “and is often referred to as a red or blood moon.

‘As for the blue moon, it’s not actually blue! It is a name now used to describe a second full moon in a month.”

He said there is confusion around the meaning of ‘blue moon’. The term used to describe a fourth full moon in a season – which normally has three. It now describes the second full moon in a calendar month which happens about every 2.7 years.

In a rare set of circumstances, a second blue moon in two months will rise at the end of March this year, which follows on from a series of three supermoons over the Australian summer.

Across the NSW North Coast and Gold Coast, the super red blue moon starts at 10.48pm (NSW time), eclipsing fully from 11.51 pm to 1.07 am, ending at 2.11am, with a clear view to the north the best for viewing the super red blue moon.

Professor Boyd confirmed that the supermoon is associated with higher-than-usual tides, but said they are not the only control over high tides.

‘There have been especially high tides worldwide recently. These are linked to the supermoon, but also caused by the peak of an 18.6-year cycle of the moon … just another interesting convergence of lunar events,” he said.

However, Professor Boyd emphasised that, despite what some might believe, the moon doesn’t cause natural disasters.

‘I’m not an astrophysist or astronomer, but as a geographer I take a keen interest in these natural earthly phenomena,’ he said.

‘There is no link between the moon and geological events such as tsunamis and earthquakes. These geological processes do not need the moon to do anything. They happen for entirely different earthly causes.’

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  1. Thanks for this info Professor Bill Boyd.

    It’s in the calendar as a must see.

    The red colour I assume, is the ring of sunsets and sunrises simultaneously around the entire planet Earth at that time.


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