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Today is: April 28
Scroll to explore events active on this date.
For the current year, this category includes: 3160 events.
Category: Science & Mathematics
Highlighting global events relating to the sciences and mathematics.
Science and math is a heavy-duty category covering a lot of ground. It focuses on the sciences, including but not limited to astronomy, biology, chemistry, physics, geography, anthropology, engineering, and mathematics.
Science & Math Events
Moon—First Quarter: January 6
Daily
The first quarter moon occurs when the moon is one-half illuminated by the sun. Each day forward increases the amount of the moon you can see. The first quarter typically occurs seven days after the New M...
January
Moon—Full: January 13
Daily
A full moon occurs when the moon is illuminated by the sun and on the opposite side of the earth. Its ecliptic longitude is 180 degrees. For centuries, people have applied names to full moons to track th...
January
Moon—New: January 29
Daily
The new moon occurs when the moon and the sun have the same elliptical longitude when the moon is at its closest point to the sun in its orbit. From earth, we usually cannot see it. The new moon is consid...
January
Moon—Third Quarter: January 21
Daily
Today is the third quarter of the moon, meaning it is halfway between the full moon and the new moon.
January
Old Rock (Petrologist) Day: January 7
Daily
The Mineralogical Society of America hosts Old Rock (Petrologist) Day on January 7 each year. Whether it's about a "pet" rock or simply going out and learning about the topography around you, today is the...
January
Perihelion Day: January 4
Daily
Perihelion Day is the day when the Earth is closest to the Sun. This day changes yearly, but it's usually in early January. The word "perihelion" comes from the Ancient Greek words "peri," meaning...
January
Programmers Day, Intl: January 7*
Daily
International Programmers' Day is one of two days celebrating the men and women behind nearly every modern tool and convenience, from your car and videos to smartphones and the internet. These people make...
January
Quantum Science and Technology, Internatio...
Annual
<h2>UNITED NATIONS' </h2><h1>INTERNATIONAL YEAR OF QUANTUM SCIENCE AND TECHNOLOGY</h1><span><br>Recognizing the transformative potential of quantum science and technology, the United Nations has declared...
January
Rotating Earth Day (1851): January 8
Daily
Physicist Jean Foucault had many theories he would go on to prove. But, on January 8, 1851, he tested one of those theories. He believed the earth, being spherical, rotated on an axis. This axis causes da...
January
Sand and Dust Storms, Intl. Decade on Comb...
Decade
<h2>THE UNITED NATIONS' INTERNATIONAL DECADE </h2><h1>ON COMBATING SAND AND DUST STORMS</h1><span><br>The United Nations has proclaimed an International Decade for Action to Combat Sand and Dust Storms, e...
January
Science Fiction Day (1920): January 2
Daily
International Science Fiction Day is celebrated annually on January 2, the birthday of science fiction author Isaac Asimov (January 2, 1920 - April 6, 1992). Asimov was a Russian-American author and pro...
January
Skeptics Day, Ntl.: January 13*
Daily
National Skeptics Day celebrates skepticism and its innumerable gifts. It is one of two Skeptic’s Days on the calendar, with the second, International Skeptics Day, in October.
January
Solar Cycle 25: 2025
Annual
<h1>SOLAR CYCLE 25 PEAKS:</h1><h2>WHAT TO EXPECT IN JULY 2025</h2><span><br>Solar Cycle 25, which began in December 2019, is expected to peak around July 2025. This period of heightened solar activity bri...
January
Static Electricity Day: January 9
Daily
Static Electricity Day celebrates static electricity's oft-amusing and somewhat annoying physical effect. Whether you've zapped your hand on a doorknob or had your hair flip out after removing a scarf o...
January
Technology Day, Ntl: January 6
Daily
People rarely change, but how we live our lives does due to technology. Technology can be simple, such as the humble beer can (first put on sale on this day in 1935) or as complex as a computer. Technolog...
January
Thomas Crapper Day (1910): January 27
Daily
Thomas Crapper Day honors Thomas Crapper, an English plumber born in Yorkshire in 1837, who died on January 27, 1910. Crapper is errantly credited with inventing the modern flushing toilet; he did not—b...
January
Postage Stamp Day (1847): July 1
Daily
National US Postage Stamp Day marks the anniversary of selling the first US postage stamp. Before 1840, only the wealthy could afford to send letters further than their town. The postage stamps’ inventio...
January
Solar Cycle 25 Maximum: July
Monthly
SPACE WEATHER FORECASTING: WHAT TO EXPECT IN JULY 2025 As we approach the crucial peak of Solar Cycle 25 in July 2025, the significance of space weather forecasting as a vital tool for predicting and mi...
January
Zip Code Day (1963): July 1
Daily
ZIP Code Day marks the 1963 anniversary of adopting the zip code system in the United States. This simple addition to addresses has tremendous economic importance and is essential in allowing packages and...
January
Moon—First Quarter: July 2
Daily
The first quarter moon occurs when the moon is one-half illuminated by the sun. Each day forward increases the amount of the moon you can see. The 1st quarter typically occurs seven days after the new moo...
January
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