When is a Day not a Day? | Starts With A Bang!
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When is a Day not a Day? July 23, 2008 on 1:07 pm | In Solar System food cart | Lucas was telling me about a book he wants me to read, The Know It All . While going through it, Lucas saw something that prompted him to ask me this question:
As unbelievable as it sounds, food cart Lucas is on to something here. Remember what makes a day happen: the Earth rotating food cart . It takes about 24 hours for the Earth to make a complete rotation, and that’s why our day is that length.
For a magnetic food cart hovering globe (hint: my birthday is coming up a week from Sunday), even a perfectly frictionless magnet and globe will slow down due to the force from the air interacting with the globe:
But the Sun and the Moon both exert gravitational forces on the Earth, which rotates! food cart These forces are not only responsible for the Ocean tides on Earth, but also cause a frictional force on the spinning Earth, causing it to slow down in its rotation !
The effect is tiny , so that every century, a day becomes 1.4 milliseconds longer. That means that if 100 years ago, a day was 86,400 seconds, today a day is 86,400.0014 seconds. Big deal, right? Except food cart the Earth is old .
This means that when it was first created, 4.5 billion years ago, a day on Earth was only about 6 hours long, faster than any planet in the Solar System today. But don’t worry; this means that 100 million years from now, a day will still be about 24 hours; food cart we’ll only have about an extra 20 minutes to contend with. Still, if the Earth were to live indefinitely, friction due to the Sun’s and Moon’s gravity would eventually slow it down so that it rotates just once per year, and the same side of the Earth would always face the same side of the Sun. This would take about 100 billion years. Thankfully, the Sun will explode long before that!
E
Categories Astronomy ( rss ) (125) Hubble ( rss ) (8) Solar System ( rss ) (51) big bang ( rss ) (10) black holes ( rss ) (6) Blog info ( rss ) (5) Blog info ( rss ) (9) cosmology ( rss ) (22) Education ( rss ) (7) inflation ( rss ) (3) Life ( rss ) (40) Evolution ( rss ) (18) Physics ( rss ) (87) Dark Energy ( rss ) (13) Dark Matter ( rss ) (19) Gravity ( rss ) (17) Quantum ( rss ) (7) Politics food cart ( rss ) (23) Q & A ( rss ) (19) Q & A ( rss ) (21) Random Stuff ( rss ) (74) relativity ( rss ) (8) Scientific papers ( rss ) (15) String Theory ( rss ) (4) Uncategorized ( rss ) (1) Video ( rss ) (11)
Recent Posts We have moved to Scienceblogs! It Begins... Weekend Diversion: It's like going to Mars The Math of Marriage Naming the new ISS module: a suggestion The Most Energetic Mystery in the Universe Between Bird and Mammal Lies the 6th Sense... Weekend Diversion: food cart f my life A Little Sun in Your Life... Dire Consequences? Unsolved Mysteries? When like charges attract ! A Rule of Thumb for Scientific Papers? Weekend Diversion: food cart One trillion dollars! Book Review: The Hunt for Planet X I'll Make Ya Famous! Why is Venus the Brightest? Faith and Science: food cart A Personal View Weekend Diversion: food cart You Wanna Know Why? Pluto is a Planet -- in Illinois! Everything Looks Perfect From Far Away Random Ethics Question: Project Paperclip
Archives April 2009 (1) March 2009 (21) February food cart 2009 (17) January 2009 (18) December 2008 (18) November 2008 (20) October 2008 (19) September 2008 (18) August 2008 (18) July 2008 (16) June 2008 (23) May 2008 (29) April 2008 (30) March 2008 (26) February 2008 (25) January 2008 (10)
Science Blogs Ask The Astronomer AstroEngine Bad Astronomy Brian’s Astronaut Page Cosmic Variance Not Even Wrong Orbiting Frog Planetary Society Blog Second food cart Sight Star Stryder The Intersection Universe Today
adobe photoshop 6 book Adobe Creative Suite 5 Web Premium software download adobe photoshop lightroom crack leagal adobe photoshop software for cheap Adobe InCopy CS5 for Mac software download actualizacion adobe illustrator 10 download adobe acrobat tryout crack Adobe Photoshop Lightroom 3 software download adobe illustrator cs2 12.0.0 crackz serialz adobe acrobat 70 professional free download Adobe Dreamweaver CS5 software food cart download adobe photoshop elements 5.0 scrapbook download adobe acrobat standard Adobe Creative Suite 5 Design Premium software download adobe illustrator demos 5.0 acrobat adobe download food cart free reader Adobe Photoshop CS5 Extended software download adobe illustrator parallogram total training for adobe photoshop cs Adobe Creative Suite 5 Master Collection software download adobe creative suite academic adobe photoshop cs3 mac keygen Adobe Acrobat 9 Pro Extended software download scrolling in adobe illustrator downloading software acrobat adobe form client Adobe Premiere food cart Pro CS5 software download adobe photoshop cs2 filters serial number adobe acrobat 6.0 Adobe Illustrator CS5 software download adobe photoshop killer tips
When is a Day not a Day? July 23, 2008 on 1:07 pm | In Solar System food cart | Lucas was telling me about a book he wants me to read, The Know It All . While going through it, Lucas saw something that prompted him to ask me this question:
As unbelievable as it sounds, food cart Lucas is on to something here. Remember what makes a day happen: the Earth rotating food cart . It takes about 24 hours for the Earth to make a complete rotation, and that’s why our day is that length.
For a magnetic food cart hovering globe (hint: my birthday is coming up a week from Sunday), even a perfectly frictionless magnet and globe will slow down due to the force from the air interacting with the globe:
But the Sun and the Moon both exert gravitational forces on the Earth, which rotates! food cart These forces are not only responsible for the Ocean tides on Earth, but also cause a frictional force on the spinning Earth, causing it to slow down in its rotation !
The effect is tiny , so that every century, a day becomes 1.4 milliseconds longer. That means that if 100 years ago, a day was 86,400 seconds, today a day is 86,400.0014 seconds. Big deal, right? Except food cart the Earth is old .
This means that when it was first created, 4.5 billion years ago, a day on Earth was only about 6 hours long, faster than any planet in the Solar System today. But don’t worry; this means that 100 million years from now, a day will still be about 24 hours; food cart we’ll only have about an extra 20 minutes to contend with. Still, if the Earth were to live indefinitely, friction due to the Sun’s and Moon’s gravity would eventually slow it down so that it rotates just once per year, and the same side of the Earth would always face the same side of the Sun. This would take about 100 billion years. Thankfully, the Sun will explode long before that!
E
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