Astronomers and coastal observers are preparing for a 'super new Moon', a celestial phenomenon that, despite its invisibility, will have a tangible effect on Earth's oceans. Occurring when the Moon is at its closest point to Earth in its orbit – a position known as perigee – simultaneously with the new Moon phase, this event intensifies the gravitational forces influencing our planet's tides.
A new Moon itself is characterised by the Moon appearing dark from Earth, as its illuminated side is facing away from us. When this phase coincides with perigee, the Moon's gravitational pull on Earth is at its strongest. This alignment, combined with the gravitational pull of the Sun, leads to significantly higher and lower tides than usual, commonly referred to as 'spring tides'. The 'super' designation simply highlights the Moon's proximity, amplifying these natural tidal variations.
While the super new Moon will not be a spectacle for stargazers, its impact will be most noticeable along coastlines. The enhanced gravitational pull causes the oceans to bulge more significantly, resulting in higher high tides and lower low tides. This phenomenon is a regular occurrence, with supermoons – both new and full – happening several times a year due to the elliptical nature of the Moon's orbit around Earth.
For the UK, the implications of these amplified tides are primarily related to coastal management and safety. During periods of spring tides, particularly when combined with adverse weather conditions such as strong winds or low-pressure systems, there is an increased risk of coastal flooding. This can affect low-lying areas, coastal paths, and infrastructure, requiring local authorities and the Environment Agency to monitor sea levels closely.
Understanding the dynamics of the super new Moon helps in predicting and mitigating potential impacts. Although an invisible event, its influence underscores the profound connection between celestial mechanics and the daily rhythms of our planet, particularly for island nations like the UK with extensive coastlines.