99 Percent of the World Will Be in Daylight at the Same Time: But How?

Every year, on specific days, almost the entirety of our planet is simultaneously located within sunlight or the twilight belt. Under normal conditions, it is accepted that half of the world is always in day, while the other half is in night. However, the dense population of the Northern Hemisphere and the long days experienced during the summer season change this situation in a very interesting way. On dates such as 8 Temmuz, approximately 99 percent of the global population is simultaneously located in daylight, dawn, or twilight zones. This situation means that only 80 milyon people remain in the night zone.

The main reason for such an extraordinary event is that a large portion of the world's landmasses, and therefore the human population, is located in the Northern Hemisphere. Especially since large parts of the Asia, Europe, Africa, and America continents are positioned in the north, the enormous population density in these regions directly affects the statistics. During this period, because the Northern Hemisphere is experiencing the summer season, days are much longer and nights are quite short. Thus, even if the sun has set, many people continue to remain in various twilight phases instead of complete darkness. This unique demographic and geographic picture allows such a high percentage to be exposed to daylight only during a specific period of the year.

Detailed calculations carried out by the Timeanddate.com platform reveal the details of this interesting phenomenon with numbers. Accordingly, around 14.00 Yunanistan saatiyle (UTC 11.00), approximately 83 percent of the world population, meaning 6.9 billion people, are directly exposed to sunlight. At the same time, about 581 million people are located in the 'civil twilight' region, where the sun is just below the horizon line. In this region, since the sun is at most 6 degrees below the horizon, it is still light enough for many outdoor activities.

The 'nautical twilight' and 'astronomical twilight' phases, which begin as the sun descends further below the horizon line, are also included in these simultaneous daylight statistics. During these periods, although the sky begins to darken slowly, according to calculations, the diffraction of sunlight is still present. While approximately 498 million people live in the nautical twilight in these zones, 249 million people are located in the astronomical twilight region, where the sky is almost completely dark. However, due to high light pollution in city centers, individuals in the astronomical twilight phase may perceive the situation as complete night.

Although it sounds like a one-time and short-term event, this phenomenon actually occurs for about 60 days every year. Starting around 18 Mayıs, this process maintains similar rates until 17 Temmuz, depending on the planet's tilt and the distribution of population density. After the summer solstice, the sun being less visible in more northern and less populated regions, but the day lengthening in crowded regions closer to the south such as Endonezya and Filipinler, shapes this extraordinary statistic. This situation means a massive festival of lights for the Northern Hemisphere and the vast majority of the world population during the summer months.