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What exactly is a supermoon and is it rare?

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The Supermoon.

S

Supermoon.

STEP outside today, November 14, just after sunset and look to the northeast and you will see a large moon rising (assuming it is clear). Looks huge, right? Much bigger than normal? There are lots of reports in the media about this massive supermoon and how the full moon won't appear this big again until 2034. But what exactly is a supermoon and is it rare?

The moon orbits the earth, but it doesn’t orbit in a perfect circle. Its orbit is elliptical. There is a point in the moon’s orbit when it is closest to earth (perigee) and another point when it is furthest away (apogee). When a full moon coincides with the perigee we experience a supermoon. In this instance, the full moon and the closest point in the orbit line up very closely meaning that November's full moon is over 14% bigger and 30% brighter than a full moon that occurs when it is at apogee. This is the largest the full moon will appear for almost 70 years. When compared to a full moon at its average distance from earth, the moon will appear 7% larger and 16% brighter.

Adding to the spectacle is a phenomenon known as the moon illusion. Simply put, when the moon has just risen, we tend to see it close to trees, buildings, hills and the horizon. We have a frame of reference for it and so the moon looks bigger than it actually is. The same moon, later on in the evening, when it is high up overhead will appear much smaller. In fact, if you were to measure the actual size of the moon when it is overhead and when it is close to the horizon, you would discover that they are the same.

As for the rarity of a supermoon? It's not quite as rare as a blue moon; a supermoon (depending on definition) occurs once every 13 or 14 months, whereas a blue moon (the third of four full moons that occur in a quarter of a year) happens every two or three years. If you miss this supermoon, not to worry, The supermoon of January 2018 will be at a distance of 356,605km, a mere 82km further away that this one.

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LOCAL GOLD:

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LOCAL GOLD: Terrie O’Shea, founder and owner of Killarney-based business Sorella Berries, celebrating her Gold award win at the Blas na hÉireann Irish Food Awards held in Dingle last week. Her hand-crafted chocolate covered strawberries secured the top spot in national competition, earning recognition for the local food producer on the national stage.

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Grady demands Killarney traffic review

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Killarney councillor Martin Grady has called for an urgent review of traffic management across the town following severe delays along the Muckross Road during the morning rush hour.

Constituents living along Muckross Road, Woodlawn, and outer Muckross areas raised serious concerns with the local representative, reporting that motorists now face delays of over 30 minutes to travel from Flesk Bridge or Woodlawn Cross into Killarney town.


The situation is causing major disruption for parents doing school runs and commuters traveling to work every morning.


“This level of congestion is simply not acceptable,” said Cllr Grady. “I have been contacted by constituents who are experiencing significant delays every morning, with parents trying to get their children to school and people trying to commute into work being caught in traffic for prolonged periods.”


Cllr Grady urged Kerry County Council to look closely at the operation and light sequencing along the route.


“I am calling for a review of the traffic situation along the Muckross Road, including the operation and sequencing of the traffic lights and whether there are any other obstructions or traffic management issues contributing to the delays,” he said.


He stressed that the gridlock is not isolated to one approach road, but affects the entire urban area as population and traffic volumes continue to rise year on year.


“But this issue goes beyond the Muckross Road. Killarney as a whole is experiencing increasing levels of traffic congestion across the town. The people of Killarney have been suffering with traffic for far too long, and the situation is getting worse,” Cllr Grady said.


“Our population is growing and traffic volumes are increasing year on year. We need to look at the bigger picture and develop a proper traffic management plan for Killarney. We need to identify where the problems are, examine how traffic is being managed across the town and put measures in place to improve traffic flow. The current situation has gone beyond what is acceptable for residents, commuters and visitors to Killarney.”

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