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21 Sep 2020 08:08:52 UTC
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APOD: 2020-09-21 - Omega Sunrise (Narrated by Emma)
Astronomy Picture of the Day - September 21st, 2020 - Omega Sunrise (Narrated by Emma)
Capturing this sunrise required both luck and timing. First and foremost, precise timing was needed to capture a sailboat crossing right in front of a rising Sun. Additionally, by a lucky coincidence, the background Sun itself appears unusual -- it looks like the Greek letter Omega (Ω). In reality, the Sun remained its circular self -- the Omega illusion was created by sunlight refracting through warm air just above the water. Optically, the feet of the capital Omega are actually an inverted image of the Sun region just above it. Although somewhat rare, optical effects caused by the Earth's atmosphere can make distant objects near the horizon -- including the Sun and Moon -- look quite unusual. This single exposure image was taken over the Mediterranean Sea just over two weeks ago near Valencia, Spain.
Image Credit & Copyright: Juan Antonio Sendra
Source: https://apod.nasa.gov/apod/ap200921.html
This video was auto generated using data from NASA Open API.
...
https://www.youtube.com/watch?v=ILqRNURPvdI
Capturing this sunrise required both luck and timing. First and foremost, precise timing was needed to capture a sailboat crossing right in front of a rising Sun. Additionally, by a lucky coincidence, the background Sun itself appears unusual -- it looks like the Greek letter Omega (Ω). In reality, the Sun remained its circular self -- the Omega illusion was created by sunlight refracting through warm air just above the water. Optically, the feet of the capital Omega are actually an inverted image of the Sun region just above it. Although somewhat rare, optical effects caused by the Earth's atmosphere can make distant objects near the horizon -- including the Sun and Moon -- look quite unusual. This single exposure image was taken over the Mediterranean Sea just over two weeks ago near Valencia, Spain.
Image Credit & Copyright: Juan Antonio Sendra
Source: https://apod.nasa.gov/apod/ap200921.html
This video was auto generated using data from NASA Open API.
...
https://www.youtube.com/watch?v=ILqRNURPvdI
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In 46 BC Julius Caesar reformed the calendar system. Based on advice by astronomer Sosigenes of Alexandria, the Julian calendar included one leap day every four years to account for the fact that an Earth year is slightly more than 365 days long. In modern terms, the time it takes for the planet to orbit the Sun once is 365.24219 mean solar days. So if calendar years contained exactly 365 days they would drift from the Earth's year by about 1 day every 4 years and eventually July (named for Julius Caesar himself) would occur during the northern hemisphere winter. By adopting a leap year with an extra day every four years, the Julian calendar year would drift much less. In 1582 Pope Gregory XIII provided the further fine-tuning that leap days should not occur in years ending in 00, unless divisible by 400. This Gregorian Calendar system is the one in wide use today. Of course, tidal friction in the Earth-Moon system slows Earth's rotation and gradually lengthens the day by about 1.4 milliseconds per century. That means that leap days like today will not be necessary, about 4 million years from now. This Roman silver coin, a denarius, depicts Julius Caesar (left) and Venus, Roman goddess of love.
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Credits: David McCandless, InformationIsBeautiful.net.
License: Creative Commons BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/
Source: https://informationisbeautiful.net/beautifulnews/1163-ocean-cleanup
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Image Credit & Copyright: Adam BlockSteward Observatory,
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Source: https://apod.nasa.gov/apod/ap200511.html
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