Happy equinox! The Sun will cross the celestial equator at 4:57 UT, heralding the first day of spring in the northern hemisphere. To honor the day, NASA released this cool image produced using solargraphy, a technique that follows the Sun's annual trek across Earth's sky.
In fact, three analemma curves were captured using a cylindrical pinhole camera by daily making three, separate, one minute long exposures for a year, from March 1, 2013 to March 1, 2014, on a single piece of black and white photographic paper. The well-planned daily exposures began at 10:30, 12:00, and 13:30, CET from a balcony looking south from the Kozanów district in Wrocław, Poland. That year's two equinoxes on March 20 and September 22 correspond to the mid-points, not the cross-over points, along the figure-8 shaped curves. Apparent gaps in the curves are due to cloudy days. Two solid lines at the lower left were both caused by a timer switch failure that left the pinhole shutter open.
Image credit: NASA
Scientists have developed new ways of understanding how the biological forces of death drive important life processes.
- Researchers have found new ways on how decomposing plants and animals contribute to the life cycle.
- After a freak mass herd death of 300 reindeer, scientists were able to study a wide range of the decomposition processes.
- Promoting the necrobiome research will open up new areas of inquiry and even commerce.
What do we see from watching birds move across the country?
- A total of eight billion birds migrate across the U.S. in the fall.
- The birds who migrate to the tropics fair better than the birds who winter in the U.S.
- Conservationists can arguably use these numbers to encourage the development of better habitats in the U.S., especially if temperatures begin to vary in the south.
Explore how alcohol affects your brain, from the first sip at the bar to life-long drinking habits.
- Alcohol is the world's most popular drug and has been a part of human culture for at least 9,000 years.
- Alcohol's effects on the brain range from temporarily limiting mental activity to sustained brain damage, depending on levels consumed and frequency of use.
- Understanding how alcohol affects your brain can help you determine what drinking habits are best for you.
SMARTER FASTER trademarks owned by The Big Think, Inc. All rights reserved.