https://www.timeanddate.com/news/astronomy/99-percent-sunlight-july-8 timeanddate.com [ ] Sign in * Home + Home Page + Newsletter + About Us + Contact Us + Careers/Jobs + Site Map + Our Articles + Account/Settings * World Clock + Main World Clock + Extended World Clock + Personal World Clock + World Time Lookup + UTC Time * Time Zones + Time Zones Home + Time Zone Converter + International Meeting Planner + Event Time Announcer + Time Zone Map + Time Zone Abbreviations + Daylight Saving Time + Time Changes Worldwide + Time Difference + Time Zone News * Calendar + Calendars Home + Calendar 2022 + Calendar 2023 + Monthly Calendar + Printable Calendar (PDF) + Add Your Own Calendar Events + Calendar Creator + Advanced Calendar Creator + Holidays Worldwide + On This Day in History + Months of the Year + Days of the Week + About Leap Years * Weather + Worldwide + Local Weather + Hour-by-Hour + 2-Week Forecast + Past Week + Climate * Sun & Moon + Sun & Moon Home + Sun Calculator + Moon Calculator + Moon Phases + Night Sky + Meteor Showers + Day and Night Map + Moon Light World Map + Eclipses + Live Streams + Seasons * Timers + Timers Home + Stopwatch + Timer + Countdown to Any Date + New Year Countdown * Calculators + Calculators Home + Date to Date Calculator (duration) + Business Date to Date (exclude holidays) + Date Calculator (add / subtract) + Business Date (exclude holidays) + Weekday Calculator + Week Number Calculator + Distance Calculator + Distance Signpost * Apps & API + iOS Apps + Android Apps + Free Clock + Free Countdown + API for Developers * Free Fun + Free & Fun Home + Free Clock for Your Site + Free Countdown for Your Site + Word Clock + Fun Holidays + Alternative Age Calculator + Date Pattern Calculator + Fun Fact Articles * My Account + My Account + My Location + My Units + My Events + My World Clock + My Privacy + Paid Services + Sign in + Register Home Sun & Moon Astronomy 99% of World Population Get Sunlight on July 8 Fact Check: 99% of the World's Population Gets Sunlight at the Same Moment on July 8 By Konstantin Bikos. Published 4-Jul-2022RSS A fascinating claim is circulating the internet: that there's a moment each year when 99% of the world's population gets sunlight. Is it true? Illustration image Illustration image Our Day and Night World Map for July 8 at 11:15 UTC shows most of the world's landmasses receiving sunlight. (c)timeanddate.com It Happens on July 8 at 11:15 UTC As July rolls around, our number crunchers thought it was worth fact-checking a July-related claim that has been making the rounds on the internet lately. In the original post, Reddit user GiddySwine presents a still image of our Day and Night World Map, claiming that 99% of the world's population is between dawn and dusk on July 8 at 11:15 UTC. A more widely circulated version claims that 99% of the population gets daylight at that moment. Convert July 8, 11:15 UTC to your time zone The Day and Night World Map uses different shadings for day, night, and the three stages of twilight: * The lightest shading represents daytime when the Sun is above the horizon. * The darkest shading is nighttime when the Sun is below the horizon, and there's no twilight. * The shadings between day and night are the three stages of twilight when the Sun is below the horizon, but there's still some indirect sunlight. Covers the World's Most Populated Areas A brief look at our Day and Night World Map gives some initial support to the claims (see image above). Nearly all of the world's most populated areas receive some sunlight at the time in question. Among them are North America, South America, Europe, Africa, and most of Asia. Australia, New Zealand, parts of Southeast Asia, and Antarctica are the only larger landmasses on the night side of Earth. 7.7 Billion People Get Some Degree of Sunlight When we run the detailed numbers through our computer, we also find some support for the claim. Combining timeanddate's Sun data with 2022 population data from the Center for International Earth Science Information Network at Columbia University, we found that it's nighttime for just under 80 million people on July 8 at 11:15 UTC. That leaves about 7.7 billion people--roughly 99% of us--on the side of the planet illuminated by the Sun. Over 6.4 billion of them are in the daytime, while more than 1.2 billion people experience twilight. Illustration image Illustration image (c)timeanddate So, with 83% of us getting direct sunlight and another 16% getting indirect sunlight, the claims are, in one way, correct. And, before we go any further, let us say that this alone is a fascinating fact and a great find! That said, there's a hitch: a few hundred million people on the supposedly sunlit side of Earth will think it's night. Pitch-Black Twilight Sky This is especially true for those who reside on the outermost edge of the twilight zones, within the darkest twilight phase called astronomical twilight. Here, the Sun is 12-18 degrees below the horizon. At that angle, the indirect sunlight becomes so thin that it is usually indiscernible to the naked eye. The trace amounts of light in the otherwise pitch-black sky are of concern only in very particular contexts. For example, it can hinder astronomers from observing the faintest celestial objects--hence the name of this twilight phase. Picture of night sky with the milky way in focus and trees at the bottom of the image. Astronomical twilight or nighttime? When the Sun is 12-18 degrees below the horizon, the naked eye usually fails to discern the trace amounts of indirect sunlight in the sky. (c)iStock.com/photographer3431 Hundreds of Millions Will Think It's Night So, 256.8 million people, about 3% of the world's population, are so far behind the curve that no sunlight is visible. Moreover, many people in the slightly brighter nautical twilight zone will fail to notice any daylight. Especially in urban areas, whose residents make up a majority of the total population numbers, light pollution can blend out the faint glow of the Sun, which is 6-12 degrees below the horizon at that point. Claim Confirmed, But... So, the claim is technically true if you count all twilight areas, no matter how dimly lit. But the percentage of the population actually perceiving sunlight is a bit lower. Discounting all of the people in the astronomical twilight zone and half of the population experiencing nautical twilight, we get 7204.9 million people, or about 93% of the world's population. It's still a very high number. But the wording of the more recent versions of the post, claiming that 99% of the population will " experience daylight," is somewhat misleading. Why July 8 and Not the June Solstice? When doing this fact check, one thing caught our attention: the date. By far, most people reside in the Northern Hemisphere. The June solstice, when the northern half of the globe receives the most sunlight, falls on or around June 21. Doesn't that mean even more people get sunlight on the day of the June solstice than on July 8? Well, yes and no. As before, it depends on if you account for human perception or simply follow the technical definitions of the twilight phases. July 8: Most People in Daytime or Twilight Following the technical approach, July 8 is indeed a better date than June 21. As the Sun slowly makes its way south after the solstice, its rays gradually retreat from northern areas. However, at 11:15 UTC, this change affects only largely unpopulated areas, such as the northern Pacific Ocean. At the same time, the Sun's southward movement extends its reach farther south, for example, in Indonesia and the Philippines. Although the change is tiny in geographical terms, it covers some of the world's most densely populated areas and adds about 10 million people to the twilight and daylight zones. Comparing June 21 and July 8 Date June 21, 2022 July 8, 2022 Night 89.7 million people (~1%) 79.7 million people (~1%) Astronomical 234.2 million people 256.8 million people twilight (~3%) (~3%) Nautical twilight 430.6 million people 433.1 million people (~6%) (~6%) Civil twilight 575.9 million people 548.0 million people (~7%) (~7%) Day 6427.6 million people 6440.3 million people (~83%) (~83%) June 21: More Visible Sunlight Interestingly, while more people are on the night side of Earth at 11:15 UTC on the solstice than on July 8, the number of people experiencing civil twilight--the brightest twilight phase--is also considerably larger: 575.9 million people on June 21 and 548.0 million people on July 8. So, of the people in the twilight zones, a larger percentage experience discernible twilight on June 21. If we again discount the astronomical twilight zone and half of the nautical twilight zone, the total number of people actually noticing sunlight increases to 7218.8 million--nearly 14 million more than the 7204.9 million people doing so on July 8. 11:15 UTC Is the Perfect Moment Whichever definition you use, the day-to-day difference is relatively small during this time of the year. However, one fact remains undisputed: 11:15 UTC is indeed the perfect moment each day when dawn begins on the North American west coast while dusk still reigns in East and Southeast Asia. Get Ready for the Instant of Global Sunlight If you want to mark the moment when most of humanity is bathed in sunlight, you can see the seconds tick down with our countdown. And while you bask in the Sun, please spare a thought for our friends Down Under who are among the 1% experiencing actual nighttime at that moment--irrespectively of definitions and technicalities. Topics: Fun, Sun, Astronomy, Dates, Earth, Geography, July, Seasons, Solstice Sunrise & Sunset Times [ ] [dn-map-squ] Day and Night World Map The Day and Night World Map shows the Sun's current position and where it is night and day throughout the world at that point of time. Equinoxes & Solstices 1. What Are Equinoxes and Solstices? 2. March Equinox 3. June Solstice 4. September Equinox 5. December Solstice 6. Equinox: Day & Night Not Equal 7. Equilux: When Day & Night Are (Actually) Equal Equinoxes & Solstices: Fun Facts 1. 10 Facts about the March Equinox 2. 10 Facts about the June Solstice 3. 10 Facts about the September Equinox 4. 10 Facts about the December Solstice 5. 99% Of Us See Daylight at This Moment (Or Do We?) Advertising Elsewhere on timeanddate.com A tree changing through the four seasons. What Causes Seasons? Seasons change because Earth's rotational axis tilts away or towards the Sun during the course of a year. Calendar of Cosmic Events 2022 Cosmic Calendar Celestial events and highlights of 2022 including supermoons, solar and lunar eclipses, meteor showers, solstices, and equinoxes. Frozen lake and snowy forest Winter Start 2022 Winter starts at the winter solstice. When is the winter solstice this year? [summer-dog] When Is Summer 2022? When is the summer solstice 2022 in the southern and northern hemispheres? How was your experience? Thank you for your feedback! Contact Us Illustration of a pink shield with a white heart. Love Our Site? Become a Supporter * Browse our site advert free. * Sun & Moon times precise to the second. * Exclusive calendar templates for PDF Calendar. 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