00:02Let's blow your mind with some so cool science time.
00:08Why do we have a 24 hour date?
00:10Well, that's a wicked cool question and I got a wicked cool way of showing you something that's not gonna
00:15take hours.
00:16You know, like sitting at the DMV.
00:18Waiting to get your driver's license renewed.
00:20Driver's license renewed but not your marriage license?
00:23Who came up with that?
00:24Four years from now we're gonna hate each other.
00:25Because today I'm gonna show you a wicked cool Sutton Isle that anyone can make.
00:30Yeah, even even gen beta.
00:32Yeah, you know, not only can they not read, they can't even count coins.
00:36This is a quarter. This is a dime.
00:38If you don't know their value, don't work the frickin' register!
00:41Start by getting yourself a paperclip.
00:42Bend the paperclip, leaving just one of the bends.
00:45And go online and find your location's latitude.
00:48Then get your protractor.
00:49Bend the paperclip to the same angle as your latitude.
00:52Use some tape to go ahead and secure the paperclip in place.
00:56No, that's so wicked cool!
00:57See, you made a protractor right there!
00:58No, you didn't make a protractor.
00:59You did not make a protractor.
01:01You had the protractor.
01:02And then you made a sundial.
01:06And there you go.
01:07You just made yourself a very wicked cool sundial right at home.
01:10And okay, here's the wicked cool part.
01:11How many degrees do you think it would take the sun to move one hour?
01:16The answer is actually 15.
01:17Yeah, and if you take 15 and you divide it by 180, you get 12 hours!
01:22That's so wicked cool!
01:24So, why is it that we have a 24-hour day?
01:27Well, don't look at me!
01:29Take a closer look at this!
01:32To understand why we have a 24-hour day, first we have to go back to Ancient Egypt.
01:36The Ancient Egyptians noticed that on the equinoxes,
01:3912 constellations would pass through the same spot that the sun had set.
01:43However, during the summer, there was more light, less night, and fewer constellations passed,
01:50making an hour in the summer 45 minutes.
01:52And of course, the opposite is true of winter, making the hour longer.
01:56It wasn't until the Ancient Greeks, around 500 B.C.,
01:58fine-tuned an already created sundial by making the sundial inverted, keeping time more closely.
02:04But even this sundial was not perfect, as time would seem to shift over a few days.
02:09This is because not only is the Earth rotating, the Earth is moving around the sun,
02:14making the sun appear in the sky at a different place.
02:16It wasn't until the 14th century that someone invented weighted-geared clocks.
02:21Gravity would pull a weight down, moving the gears, creating an extremely accurate measurement of time.
02:26For centuries, people used 12 as the number of hours in a day, so our clocks have a 12-hour
02:32face.
02:33Today, we use atomic clocks, which measure time extremely accurate.
02:37So accurate that we know the further you get from a gravitational force, the faster time flies.
02:43So now you know more about photonic duration.
02:46You know, being able to make a sundial that measures more than hours is why science stands the test of
02:54time.
02:54and the same.
02:56code言
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