Have you ever wondered What is that special day when we only see the sun for a few minutes before darkness returns? Every year, in the middle of December, the Spanish and the rest of the northern hemisphere experience a special date: the day with the fewest hours of sunlightBeyond simple curiosity, this day marks the turning point from which the days slowly begin to lengthen, and we regain the spirit we so desperately need during the winter.
Let's delve into the fascinating phenomenon What gives rise to the shortest day of the year, why it occurs, how it affects different parts of the planet, and what traditions and curiosities revolve around this astronomical eventPlus, you'll discover figures, real-life examples, cultural influences, and even tips for coping with the reduced sunlight in our daily lives.
Which day has the fewest hours of sunshine?
El Winter Solstice It is the astronomical instant that determines the shortest day and longest night of the year in the northern hemisphere. It usually occurs between December 20 and 23. For Spain and most of Europe, The date usually falls on December 21 or 22On that day, the The sun reaches its lowest point on the horizon during midday and describes the smallest arc in the sky.larvae, nymphs, and adults, so we receive the least amount of sunlight of the entire year.
For example, in cities like Madrid, The shortest day allows for just nine hours of light., compared to the more than fifteen hours we have in the middle of summer. In 2024, the winter solstice will occur on December 21 at 10:21 a.m. Spanish peninsular time. From that moment on, The days will begin to lengthen, although at first almost imperceptibly..
This phenomenon is universal, but its date and intensity vary according to latitude and hemisphere. While in the north we experience our shortest day and the official onset of winter, In the southern hemisphere, the exact opposite happens: they celebrate the beginning of summer and its brightest day..
Why does the winter solstice occur and what causes it?
The explanation for this curious event lies in the inclination of the earth's axisOur planet does not rotate completely straight with respect to the orbit it describes around the Sun, but is tilted about 23,4 degreesThis seemingly insignificant detail is responsible for different regions of the Earth receive more or less sunlight throughout the year and there are seasons.
During the winter solstice in the northern hemisphere, the North Pole is tilted away from the Sun. Therefore, We barely receive any sunlight and the hours of light decrease drastically.As we move away from the equator and closer to the poles, this difference becomes much greater, to the point that near the Arctic Circle, entire areas can spend days or even months in total darkness: the famous polar night.
En summary: The tilt of the Earth's axis is the reason why some days are very short and others very long.If the planet weren't tilted, we wouldn't experience winter or summer; the length of day and night would be almost identical year-round.
What exactly happens on the shortest day of the year?
The moment that marks the Winter Solstice happens when the Earth passes through the point in its orbit where the Sun shows its maximum southern declination. At that moment, the Sun reaches its minimum elevation above the horizon for those of us who live in the northern hemisphere and traces the lowest possible arc. Therefore, The sun's rays reach us much more obliquely and the atmosphere absorbs more energy, which contributes to making it cold..
A curious detail is that the days before and after the solstice They appear almost identical in terms of daylight hours. This "stillness" in the solar position inspires the name solstice, derived from the Latin "solstitium" or "still sun." Even the National Astronomical Observatory describes it this way: On the days around the solstice, the Sun barely changes its maximum height at noon for several days.
In practice, the day with the least light varies slightly depending on the latitude. In Madrid, for example, the shortest day lasts around 9 hours and 17 minutes of sunshine., while in Seville it takes 9 hours and 35 minutes. The further north you go, the fewer the hours of daylight. In Nordic cities and within the Arctic Circle, the sun doesn't even rise. on this date, and in some Norwegian villages or in Alaska they live for weeks in complete darkness.
The polar night and the extremes of the planet
In areas near the poles, the winter solstice has even more dramatic consequences. It produces what we call polar night: a period in which the Sun does not rise at all above the horizon for days, weeks, or even entire months. At the North Pole, for example, there may be up to six consecutive months of winter darknessMeanwhile, at the South Pole, during those dates, it is midsummer and the Sun never sets: it is the "polar day."
In places like Northern Norway, some villages experience their last sunset in mid-November and don't see sunlight again until late January. For residents of these regions, the polar night is a common experience, although for those of us who live further south, it may seem incredibly exotic.
En Spain and most of Europe, the day and night cycles continue to last 24 hours. Here, the longest night coincides exactly with the winter solstice: about 15 hours of darkness, a figure that can be shocking when compared to the height of summer, when the day can last up to 15 hours of sunshine.
Why is it colder on the shortest day?
It may surprise you, but The Earth is closest to the Sun during the Northern Hemisphere winter, coinciding precisely with the solstice that marks the shortest day. The point of closest approach, called perihelion, usually occurs in the first few days of January. So why are we so cold?
The key is in the inclination at which we receive the sun's raysIn winter, the Sun sits very low on the horizon, its rays arrive "sideways," and the radiation is spread over a larger surface area and spends more time passing through the atmosphere. Therefore, The energy that actually reaches us is less and the environment cools down.
Winter Solstice: Dates, Duration, and Curiosities
El Winter Solstice It does not have a fixed date, although It usually occurs between December 20 and 23This variability is due to the way the calendar, leap years, and the actual length of the Earth's orbit fit together. In the 20st century, winter will always begin between December 22th and XNUMXnd in Spain. Every year, this phenomenon marks the beginning of meteorological winter and the shortest season of the year in terms of number of days.
Winter lasts just under 89 days in the Northern Hemisphere. The reason for this is another astronomical curiosity: The Earth's orbit is elliptical and, in winter, the planet moves faster due to its proximity to the Sun, which shortens the season compared to summer.
Is the shortest day experienced the same way throughout Spain?
Not all parts of Spain enjoy the same number of hours of daylight at the solstice. Latitude and east-west orientation have a lot of influence.The Mediterranean coast, for example, sees the sunset earlier than western Galicia, where the sun sets much later. Furthermore, the debate on the Time change It is always present: our official time is ahead of the real solar time, which means that it gets dark later in some areas and earlier in others depending on the longitude.
Although if we adjusted the schedule to better align with the solar cycle, the actual length of the shortest day would be exactly the sameI would only change the way I organize my life and work to make better use of available light.
The cycle of solstices and equinoxes
El astronomical year It is divided into key points: the two solstices (winter and summer) and the two equinoxes (spring and autumn). The solstices mark the moment when the Earth's axis is most tilted with respect to the Sun., giving rise to the longest and shortest day respectively.
Meanwhile, the equinoxes They occur when the Sun is aligned with the Earth's equator: on that day, all over the planet, day and night last almost the sameIt is the point of balance and marks the beginning of spring and autumn, transitional periods in which the duration of light and darkness become equal before shifting again to one extreme or the other.
Winter Solstice Celebrations and Traditions
The arrival of winter and the shortest day have been so significant for humanity that There are rituals, festivals and ancestral beliefs in practically all cultures.
- In ancient Rome, the Saturnalia It was a week of celebrations, gifts and banquets.
- In the Andes, the Incas celebrate the Inti Raymi as the beginning of the new solar year.
- In Scandinavia, the Midsummer and the summer solstice are central events; in contrast, winter is associated with contemplation and waiting for light.
- The festival Dongzhi in China and the Yalda Night In Iran they also mark survival and hope for longer days.
- In Spain and other European countries, the Christmas absorbed many of these pagan customs, celebrating very close to the solstice.
Also, places like Stonehenge In the United Kingdom or the dolmens of Antequera in Andalusia are oriented to the solstice as a sign of the importance that humans have given to this phenomenon and to astronomical observation since ancient times.
Astronomical curiosities and sky observation in winter
The Winter nights are ideal for looking at the sky, as they tend to be drier and darker. During the winter, constellations such as Orion, Taurus, Canis Major and Gemini and you can see bright planets like Jupiter, Saturn, Venus and Mars depending on the month. We are also visited by characteristic meteor showers like the Ursids and Quadrantids.
In winter the propensity to seasonal sadness, known as "winter blues." Exposure to sunlight, even in limited amounts, helps increase endorphin production. Therefore, it's recommended to get outdoors whenever possible to take advantage of those few minutes of light.
The winter solstice around the world: facts and figures
- The solstice is global, but the experience varies greatly. For example, in Oslo, Norway, there are just over six hours of daylight, while in Nome, Alaska, there are barely four, and in areas within the Arctic Circle, the sun doesn't even rise.
- In Ecuador, the solstice goes almost unnoticed: the days are almost always the same length.
- In the southern hemisphere, it occurs on June 21, marking the beginning of the southern hemisphere winter.
- The solstice cycle has been the basis of calendars, agricultural festivals, and solar rites for millennia.
Some frequently asked questions about the shortest day
- Is December 21st always the shortest day? No, it can vary between the 20th and 23rd depending on the year and time zone.
- Does the coldest weather coincide with the solstice? Not exactly. The cold usually intensifies a few weeks later, because the land and oceans still retain some of the summer heat.
- Do sunrise and sunset times coincide throughout the country? No, it varies depending on the area. In the west, it gets dark later than in the east, although the total number of hours of sunlight is similar.
This astronomical event not only marks the beginning of winter, but also has a profound influence on the culture, history, and mood of millions of people. The light, although scarce, slowly returns, symbolizing a cycle of change and hope across the planet. Take the opportunity to look up at the sky, celebrate traditions, and enjoy the gradual return of light.