26d • General Discussion
September: The month when daylight disappears the fastest
As summer fades and autumn approaches, nature reminds us of an inevitable shift: the days grow shorter, and they do so at a faster pace in September than in any other month of the year. September is when we lose the most daylight minutes each day, all due to the tilt of Earth’s axis and its orbit around the Sun.
How much daylight do we lose?
- In the northern states, such as Montana and the Dakotas, as much as 100 minutes of daylight are lost throughout September.
- In the central regions, cities like Denver or Kansas City experience around 70 minutes of loss.
- In the southern states, from Texas to Florida, the decrease is smaller but still noticeable: between 40 and 50 minutes.
This phenomenon occurs because the Northern Hemisphere gradually tilts away from the Sun after the summer solstice in June. In September, this change accelerates, paving the way for the autumn equinox (around September 22 or 23), when day and night are nearly equal all over the world.
More than just an astronomical fact
The loss of daylight impacts much more than just the length of our days:
- Mood and energy: Many people feel more tired or melancholic, a prelude to what is known as Seasonal Affective Disorder (SAD).
- Nature: Plants, animals, and entire ecosystems respond to this shift in light by adjusting their biological rhythms.
- Daily life: Outdoor activities get shorter, and our sense of time can make it feel like the days “fly by” more quickly.
A reminder of natural cycles:
While it may seem that darkness is gaining ground too quickly, this adjustment is part of Earth’s natural balance. The shortening of daylight in September prepares us for the calm of autumn and the stillness of winter, reminding us that life flows in cycles and that every season has its own purpose.
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September: The month when daylight disappears the fastest
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