00:02oh hey hi I'm crazy Chris and welcome to so cool science science you can do
00:08right at home I'm just doing some shoveling and today's science file says
00:19how do we know the earth is tilted try this
00:31you will need a basketball and a flashlight okay the basketball is gonna act like our earth that
00:39goes around the Sun the flashlight is gonna act like the Sun's light here we go so your basketball
00:51is gonna be right there now if this was really the earth it would actually be like this it would
00:57have a tilt see that would be the equator and that would be the axis the the tilt shine your
01:05flashlight from right here straight on to the basketball like like this
01:21haha see now it's gotta be there's gotta be batteries okay now now now shine it like this
01:29when you flash the light straight on you get a circle now that is that's pretty cool now move
01:35your flashlight up a little so it looks like this now the light is more spread out so what's going
01:42on here well take a look at this the earth's access or imaginary line on which it turns is tilted
01:50slightly
01:51further than 23 degrees earth tilt causes the north pole to be tilted towards the Sun for half of the
01:57year and the south pole to be tilted towards the Sun for the other half of the year when it's
02:02summer in
02:02the northern hemisphere the northern half is tilted towards the Sun of course the southern hemisphere
02:08the southern half is tilted away from the Sun making it winter when the earth gets on the other
02:13side of the Sun they switch if the earth's axis was not tilted each night and day everywhere on earth
02:19would always be 12 hours long and there would be no seasons so now you know how the seasons work
02:26you
02:27know using a basketball a flashlight to show you how the seasons work is why science is so cool
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