Earth has reached its closest point to the Sun, known as perihelion, an astronomical event that occurs every January. Despite being nearer to our star, the UK continues to experience winter due to the tilt of Earth's axis rather than its distance from the Sun.
What Is Perihelion?
Perihelion marks the moment when Earth is approximately 91.4 million miles from the Sun—about 3 million miles closer than during aphelion in July. This phenomenon is a result of Earth's elliptical orbit, which causes slight variations in solar distance throughout the year.
Why Is It Still Cold in the UK?
While proximity to the Sun might suggest warmer weather, seasonal temperatures are primarily influenced by Earth's axial tilt. In January, the Northern Hemisphere, including the UK, is tilted away from the Sun, leading to shorter days and colder conditions despite the closer solar distance.
Daylight Variations Across the UK
The Royal Observatory Greenwich notes that perihelion subtly affects daylight duration. For example, northern regions like the Yorkshire Dales may see slightly more daylight compared to southern areas, though the difference is marginal.
Future Implications
Over millennia, gravitational interactions with other planets will gradually alter Earth's orbit, potentially shifting the timing of perihelion. However, these changes occur over such vast timescales that they have no immediate impact on current weather patterns.
For now, Britons can expect the usual winter chill, with perihelion serving as a fascinating reminder of our planet's dynamic relationship with the Sun.
