Thanks Derek. it's amazing to me how many incredibly well educated folks have never considered the full moon rise / sun set scenario and why as well they see a half moon during the day. If you do get time in your busy life to do such an animation, it would be widely circulated I am sure. Best, Jane
YES! a video that isn't boring.....and this proves that an educational video can be informative AND interesting at the same time! thx Dereck PERSON!!!!! muah :)
@sportsnut712001 That's a good question. Yes, the orbits are basically elliptical, but the eccentricity of the ellipse is pretty low, which means that they are pretty close to being circular rather than being highly elliptical. The math for the circular orbits is much easier, and is generally more appropriate for 8th grade Physical Science or for high school Physics, so we often approximate the orbits as circular, while understanding that they are really slightly elliptical.
I never realized that summer for the Northern hemisphere was winter for the southern hemisphere. I was checking another diagram, and for us in the northern hemisphere, i find it funny that we are in winter when we are closest to the sun, although I guess distance does not matter much to solar radiation when in space, only the angle of the rays, as you said. Thanks for this video.
The world rotates at approx 1,000 miles per hour Earth goes around the sun at 67,000 miles per hour. The solar system goes around the galactic centre at 492,120 miles per hour. Our (milkyway) galaxy rotates around the local group of galaxies at 89,500 mph. Relative to the Cosmological Microwave Background, our Galaxy is moving at approximately 900,000 mph towards the constellations Hydra and Centaurus. Correct my figures if wrong (shouldn't be too out), just had to approx work a couple out. TY
@guyKLumpur Whether the earth is tilted left, right, forward, or back, would depend on what season it is, and from what point of view your diagram is drawn. When it is summer in the northern hemisphere, the north pole of the earth is tilted toward the sun. Hope that helps! DO
@guyKLumpur The shape of the orbit is not a perfect circle. It is close to being circular, but it is really an ellipse, so yes, the earth is closer (slightly) to the sun at some times. This has nothing to do with the equinoxes or the seasons, though. The seasons and the equinoxes are a result of the tilt of the axis, not the tiny variation in the distance from the sun.
So the Sun circles the Earth which is stationary and moves upwards in the summer and downwards in the winder from a northern hemisphere point of veiw. But what makes the Sun move, how is it motorized?
@derekowens Thanks...but... Im from korea...and how come when its summer here it summer too in america, europ, arbian gulf and asia and africa? :s its like almost the whole countries are the same? :s sorry for my to many Q...
@derekowens thanks for the answer, yeah that i know, when summer the earth is tilted towards the sun, but that does not answer my question. maybe i should ask : what is the actual tilt of the earth from it's imaginary north/south exist, towards the left or right, when you see it far from outer space?
Thank you for the video ^.^ i undestand what's going on at the begning but still don't get it when you were like its summer on the north pole while its winter in the south :s does it mean that that other half has the oppisite seasons? :s sorry if my Q is stupid... i just don't get it ^.^ thank you in advance! :)
@PisoMornar From what I understand, the difference in the distance from the sun does not affect the temperature. The different temperatures in the different seasons are due only to the angle of the sun striking the earth. Hope that helps!
very informative and colorful my college professor gives us the links to your videos to watch for class. I am curious as to which program you are using or type of technology the pictures are very clear when drawn?
@derekowens Great..now i get what u mean..one more thing that was not explained is that the earth obits around the sun in an ellipse manner, meaning at one moment it's position is a bit higher than the sun and the next moment it's position is lower than the sun. So is it right to say that at the time of both equinoxes, the position of the sun and the earth are at the same level or at a perpendicular position to each other, if u know what I am trying to say? Thank you..
Thank you for your explanations, it was very clear. I have a question: In the nights, with no sun at all, facing the "rest of the universe", wouldn't the earth become very cold. I wonder how the nights remain warm in summer, for example ? In connection to that, while it is night somewhere, during summer it is warm, but the pole is receiving some sun light, and looks closer (more near) to the sun, than the part which is in darkness. And still the part in darkness remains warm, (?)
Mr Lecturer, I would like to know: is the earth tilted from it's north/south imaginary line towards the right or towards the left? From your drawing it looks like the Earth is tilted towards the left, but on some diagrams they are shown as if the earth is tilted towards the right. Thank you.
I don't think it does. The difference in temperature due to the change in distance is small compared to the difference caused by the tilt of the earth's axis.
@RJJacobson RJ, That's a great topic. I don't have a video on that specifically, but yes, video would definitely be the way to explain that. If I get time to make such a video I will try to let you know. Thanks, DO.
I am having a rough time explaining to folks that the full moon sets with the rising sun, while the crescent moon rises (sort of) - with- the rising sun. Is there an animation or videos that demonstreates this. After all...we are standing On earth, so it's kinda hard to get it! Thanks, Jane J
@TeenageIronman The sun is not solid, and the whole sun does not rotate in a rigid manner. Different parts of the sun rotate at different speeds. The moon is basically a rigid body, though, and the rotation and revolution of the moon are known with a high degree of accuracy.
@derekowens O yah thanks ^.^ ... isnt this true too? that the nearest country to the equator is the hottest and as long as it goes far from it its gets to the coldest ? which is of course the northern and southern hemisphere right? ^.^
The dimension of the sun from the center of the earth is constant, but it changes on its surface according to the inclination of the astronomy by the sun, and this is also one of the mistakes of astronomers
This is so great!! :D I have a couple of questions I hope you will answer as perfectly clearly as you explained everything in the video: 1. Does it become dark more slowly in the summer than in the winter, or is it just me? It seems to me that in the winter day turns into night in several minutes, while in the summer, it lasts for at least a half an hour. I have a few theories why that might be (if I'm not simply crazy :D ), but am not really sure... ... -->
terrific i have question that is there any posibility that the have to change his polar possition excedently. because being a muslim we belived that at the day of judgment the sun will rise from west??????? scintifically can you prove it???? i`ll be thanx full to you if satisfy me.............
I might be wrong here, but,, it seems to me that this explanation does not make sense: a sphere is a sphere, there is NO DIFFERENCE in angle of incidence if you compere the upper half sphere and the lower half sphere! The angle is the same only, it is a mirror image! You can draw just about any axis tilt and it STILL would not matter judging from the drawing you made! The way you drew it at 6:47 , you can just as easily draw the tilt differently and STILL get the same ostensible result! What matters is, that due to the tilt in the axis of rotation, an arbitrary point A in the Northern Hemisphere gets to be positioned DAILY in such a manner that the sun strikes the surface at a angle closer to 90 degrees, whereas an analogues point A in the southern hemisphere at same time, NEVER gets to a position even close to 90 degrees! The angles that you are talking about do make a difference, but mostly in climate not so much in seasons, because the angle is ALWAYS near 90 degrees near the center of a sphere and less away. What matters is, whether a PARTICULAR point on earth gets to be positioned so that it would be as near to the 90 degrees angle as possible or not. When earth is revolving around the sun, the NATURE of the tilt RELATIVE TO THE SUN changes. That changes the movement on a point A, in summer, it so happens, that this point A, during the day, gets to be positioned relative to the sun so, that the angle of sun rays is closer to 90 degrees than it would be if it were winter.
I see what you are saying. The top half and the bottom half are symmetrical. However, if you live for example in the US, then during the summer the tilt of the axis causes your home town to be facing the sun at a more direct angle of incidence during the day and at a shallower angle during the night. During the day, of course, is when you are feeling the sunlight. Or to put it another way: You are correct that there is no difference between the top half of a sphere and the bottom half, but the tilt of the earth causes a change in where_you_are on that sphere, such that it is different in summer and winter.
The "The tilt of the earth causes a change in where you are" is a good way to put it and probably should be stressed out in order to avoid confusion. I would add "....relative to the angle of sunbeams hitting the surface" . All in all, I think it can lead to misconceptions when just saying on a still picture that "Look, this side of the earth is more towards sun or facing towards sun". Perhaps one should do a picture series like a comic book has in order to explain it...(because the tilt ONLY has meaning when the earth is rotating). Thank you for being candid with me on this.
Is your birth date same in all year ? I have a doubt. I learnt that Earth not exactly revolve the sun in 365 days. It is 365 days and 6 hours. May be the birth date can be changed right ? If your born on January 1st in morning 6 o clock 2004, and in next year your age will change January 1st in after noon 12 o clock. So it is adding 6 hours. After four years 2008, the birth date must changed on January 2nd. The life span of man enjoy the birthday in different dates and it can only take 2 months !
Your birthday doesn't change in the long run. Those 6 'extra' hours per year are what makes an extra 24 hours i.e. an extra day in a leap year every 4 years. That is why we have that extra day in our calendars every four years so that we kinda 'get back to where we started' and to get back in sync in our revolution around the sun.
but the extra day makes the year correct, but our birth date sure change to next day, if we born after february. also leap year is just kept by scientis to not to confuse, but earth always revolves its sun same!
In the winter, the northern half of the Earth is moved from the sun "only" about 800 km., given the "alleged" distance of the Sun from the Earth (149,598,262 km), so much difference in heat and power of the sun can not be. Absurd! Impossible!
The winter sun is at a much shallower angle in the sky than in summer. The result is that a given amount of sunlight striking an area on earth is spread out over a larger area. Easy to replicate this at home.
Thanks so much for the thoughtful comment. I am very glad this was helpful to you! Best of luck with the rest of your studies.
Derek Owens
Yes, I'll do that. Still busy grading exams at the moment. More playlists are coming, though.
Awsome! You are the master of explaining things! and master of drawing also =)
Big thankyou from St Petesburg, Russia!
I get it! I'm 31 and I finally get it! - Thanks for an understandable video
@Dantonio Lunsford No need to be rude
These videos are fantastic, clear and effective resources. Thank you!
I guess that you should feel honored because this is one of the many of your videos on geography we've gotten to see in Global Studies Class.
Thanks Derek. it's amazing to me how many incredibly well educated folks have never considered the full moon rise / sun set scenario and why as well they see a half moon during the day. If you do get time in your busy life to do such an animation, it would be widely circulated I am sure.
Best, Jane
YES! a video that isn't boring.....and this proves that an educational video can be informative AND interesting at the same time! thx Dereck PERSON!!!!! muah :)
That's right. When it is summer in the northern hemisphere, it is winter in the southern hemisphere.
great video and very clear explanation. many thanks for the video
Great video.... really helped me nail it. Thanks
@sportsnut712001 That's a good question. Yes, the orbits are basically elliptical, but the eccentricity of the ellipse is pretty low, which means that they are pretty close to being circular rather than being highly elliptical. The math for the circular orbits is much easier, and is generally more appropriate for 8th grade Physical Science or for high school Physics, so we often approximate the orbits as circular, while understanding that they are really slightly elliptical.
Woah! Thanks a ton for this video! You've helped me in my Geo Paper!
good job... thanks for your efforts in explaining this rotational scenario.
I thought the Sun moves and not the Earth.
thank you so much for this! this is so helpful !
I never realized that summer for the Northern hemisphere was winter for the southern hemisphere. I was checking another diagram, and for us in the northern hemisphere, i find it funny that we are in winter when we are closest to the sun, although I guess distance does not matter much to solar radiation when in space, only the angle of the rays, as you said. Thanks for this video.
At last! The best explanation / representation of the changing seasons!
XD
please the spinning orb device whats its called i really need to know it pertains to the bell exsperiment.
The world rotates at approx 1,000 miles per hour
Earth goes around the sun at 67,000 miles per hour.
The solar system goes around the galactic centre at 492,120 miles per hour.
Our (milkyway) galaxy rotates around the local group of galaxies at 89,500 mph.
Relative to the Cosmological Microwave Background, our Galaxy is moving at approximately 900,000 mph towards the constellations Hydra and Centaurus.
Correct my figures if wrong (shouldn't be too out), just had to approx work a couple out.
TY
Thanks, your explanation helped me 'get' it!
what are the reasons for earth rotation & revolution ?
Very nicely explained. Thank you!
Nice explanation! Thank you for sharing!
@guyKLumpur Whether the earth is tilted left, right, forward, or back, would depend on what season it is, and from what point of view your diagram is drawn. When it is summer in the northern hemisphere, the north pole of the earth is tilted toward the sun. Hope that helps! DO
Couldn't be any clearer. Thankyou for these educational minutes, I've learned a thing or 2 :)
Can you explain if the spin of earth is going so fast and you travel in a airport in opposite way why are flights not much more faster.
@guyKLumpur The shape of the orbit is not a perfect circle. It is close to being circular, but it is really an ellipse, so yes, the earth is closer (slightly) to the sun at some times. This has nothing to do with the equinoxes or the seasons, though. The seasons and the equinoxes are a result of the tilt of the axis, not the tiny variation in the distance from the sun.
I honestly wish you were my professor. This was an amazingly helpful explanation. Great job!
Watched this in class it was very awesome with the pictures
Dear Mr. Owens, i would like to know what kind of electronics you are using in this video? the model and the conmpany? thank you
So the Sun circles the Earth which is stationary and moves upwards in the summer and downwards in the winder from a northern hemisphere point of veiw. But what makes the Sun move, how is it motorized?
@derekowens Thanks...but... Im from korea...and how come when its summer here it summer too in america, europ, arbian gulf and asia and africa? :s
its like almost the whole countries are the same? :s
sorry for my to many Q...
Hi, could you tell me what program do you use here to draw and demonstrate. Thank you!
Dear Mr. Owens. Could you please explain something to me. Why does the earth's rotation not impede the cars or vehicles movement on the ground?
@derekowens thanks for the answer, yeah that i know, when summer the earth is tilted towards the sun, but that does not answer my question. maybe i should ask : what is the actual tilt of the earth from it's imaginary north/south exist, towards the left or right, when you see it far from outer space?
Thank you for the video ^.^
i undestand what's going on at the begning but still don't get it when you were like its summer on the north pole while its winter in the south :s
does it mean that that other half has the oppisite seasons? :s
sorry if my Q is stupid... i just don't get it ^.^ thank you in advance! :)
thanx loads!! realy didnt understand when my teacher explained u made me understand better!!
@PisoMornar From what I understand, the difference in the distance from the sun does not affect the temperature. The different temperatures in the different seasons are due only to the angle of the sun striking the earth. Hope that helps!
very informative and colorful my college professor gives us the links to your videos to watch for class. I am curious as to which program you are using or type of technology the pictures are very clear when drawn?
excellent explanation!
@guyKLumpur the north pole would point towards the north star, whichever way that would be (again, depends on your point of view)
Great video... which software are you using to draw the diagrams?
@derekowens Great..now i get what u mean..one more thing that was not explained is that the earth obits around the sun in an ellipse manner, meaning at one moment it's position is a bit higher than the sun and the next moment it's position is lower than the sun. So is it right to say that at the time of both equinoxes, the position of the sun and the earth are at the same level or at a perpendicular position to each other, if u know what I am trying to say? Thank you..
Thank you for your explanations, it was very clear. I have a question: In the nights, with no sun at all, facing the "rest of the universe", wouldn't the earth become very cold. I wonder how the nights remain warm in summer, for example ? In connection to that, while it is night somewhere, during summer it is warm, but the pole is receiving some sun light, and looks closer (more near) to the sun, than the part which is in darkness. And still the part in darkness remains warm, (?)
@804YankeeFan
dude, when u walk on the fast moving train, does ur speed actually impedes ??????
think about it and u will get ur answer
nice job,gr888 info.....thxxxxxx
Mr Lecturer, I would like to know: is the earth tilted from it's north/south imaginary line towards the right or towards the left? From your drawing it looks like the Earth is tilted towards the left, but on some diagrams they are shown as if the earth is tilted towards the right. Thank you.
I don't think it does. The difference in temperature due to the change in distance is small compared to the difference caused by the tilt of the earth's axis.
@RJJacobson RJ, That's a great topic. I don't have a video on that specifically, but yes, video would definitely be the way to explain that. If I get time to make such a video I will try to let you know. Thanks, DO.
Thank you very much. can you pleas Make it possible to view PowerPoint.
But WHY is the earth tilted on it's axis? Did it get knocked that way by some cataclysm? I can't seem to find an adequate explanation on the web.
I am having a rough time explaining to folks that the full moon sets with the rising sun, while the crescent moon rises (sort of) - with- the rising sun.
Is there an animation or videos that demonstreates this. After all...we are standing On earth, so it's kinda hard to get it! Thanks, Jane J
@TeenageIronman The sun is not solid, and the whole sun does not rotate in a rigid manner. Different parts of the sun rotate at different speeds. The moon is basically a rigid body, though, and the rotation and revolution of the moon are known with a high degree of accuracy.
@derekowens O yah thanks ^.^ ... isnt this true too? that the nearest country to the equator is the hottest and as long as it goes far from it its gets to the coldest ? which is of course the northern and southern hemisphere right? ^.^
Very nice presentation....:-)
Let me get this straight, your saying that while its summer in America it may be winter in Australia?
It is nice presentation.
nice video... it is really usefull
Earth's orbit around the Sun is very close to circular so the distance between the Earth and the Sun remains the same throughout a whole year.
The dimension of the sun from the center of the earth is constant, but it changes on its surface according to the inclination of the astronomy by the sun, and this is also one of the mistakes of astronomers
...
nice video this reminds me of my friend and mamu who is geography teacher he is gone but i miss him
Gr8 explanation
This is so great!! :D
I have a couple of questions I hope you will answer as perfectly clearly as you explained everything in the video:
1. Does it become dark more slowly in the summer than in the winter, or is it just me? It seems to me that in the winter day turns into night in several minutes, while in the summer, it lasts for at least a half an hour. I have a few theories why that might be (if I'm not simply crazy :D ), but am not really sure...
... -->
thanks
terrific
i have question
that
is there any posibility that the have to change his polar possition excedently.
because being a muslim we belived that at the day of judgment the sun will rise from west???????
scintifically can you prove it????
i`ll be thanx full to you if satisfy me.............
Smart teacher!
his is a gr8 video
One object (such as the moon) moving around another (such as the earth). So the moon revolves around the earth, and the earth revolves around the sun.
Thank you I was learning about NS for SA and I am grade 7 learner very good explanation Thank you and I was on a website and they took me to this link
Why did you watch the video then?
Pretty good explanation
verry well explained, extream awsome pc drawing skills xd
I love you.
....Thanks Hun. I love you too. x
THANK YOU IM IN ARGENTINA AND YOU HELP ME TO DO MY ENGLISH HOMEWORK
yes it dose
You drew the earth rotating clockwise, I thought it rotates anti clockwise?
It actually does. His program might've flipped around everything, I'm not sure.
Angela Qian Wait. He did draw it counterclockwise. Never mind...
@oonaboona our own moon knocked us to a tilt a couple of million of years ago.
thx
Very nice very nice very very very nice
@movieman0222 no unclear.
i will make clesr how precession is made.
see my movie for answers
What is revolution :(
very nice, any child would understand
Whats the earth
you never said how.....
A song by The Beatles.
Hi ben and remy!
its worth pointing out that the earth is actually furthest from the sun during the north's summer contrary to northern chauvinism popular belief!
@almomiyz see my movies, i have solved coral casle. and precession.. have you?
The Earth is a planet inhabited by hamsters, penguins, and other life forms. Well worth a visit if you're in that part of the galaxy.
learnt this in class today :) hmmm
i get it
Emmanuel rules!!
I might be wrong here, but,, it seems to me that this explanation does not make sense: a sphere is a sphere, there is NO DIFFERENCE in angle of incidence if you compere the upper half sphere and the lower half sphere!
The angle is the same only, it is a mirror image!
You can draw just about any axis tilt and it STILL would not matter judging from the drawing you made!
The way you drew it at 6:47 , you can just as easily draw the tilt differently and STILL get the same ostensible result!
What matters is, that due to the tilt in the axis of rotation, an arbitrary point A in the Northern Hemisphere gets to be positioned DAILY in such a manner that the sun strikes the surface at a angle closer to 90 degrees, whereas an analogues point A in the southern hemisphere at same time, NEVER gets to a position even close to 90 degrees!
The angles that you are talking about do make a difference, but mostly in climate not so much in seasons, because the angle is ALWAYS near 90 degrees near the center of a sphere and less away.
What matters is, whether a PARTICULAR point on earth gets to be positioned so that it would be as near to the 90 degrees angle as possible or not.
When earth is revolving around the sun, the NATURE of the tilt RELATIVE TO THE SUN changes.
That changes the movement on a point A, in summer, it so happens, that this point A, during the day, gets to be positioned relative to the sun so, that the angle of sun rays is closer to 90 degrees than it would be if it were winter.
I see what you are saying. The top half and the bottom half are symmetrical.
However, if you live for example in the US, then during the summer the tilt of the axis causes your home town to be facing the sun at a more direct angle of incidence during the day and at a shallower angle during the night. During the day, of course, is when you are feeling the sunlight.
Or to put it another way: You are correct that there is no difference between the top half of a sphere and the bottom half, but the tilt of the earth causes a change in where_you_are on that sphere, such that it is different in summer and winter.
The "The tilt of the earth causes a change in where you are" is a good way to put it and probably should be stressed out in order to avoid confusion. I would add "....relative to the angle of sunbeams hitting the surface" .
All in all, I think it can lead to misconceptions when just saying on a still picture that "Look, this side of the earth is more towards sun or facing towards sun". Perhaps one should do a picture series like a comic book has in order to explain it...(because the tilt ONLY has meaning when the earth is rotating).
Thank you for being candid with me on this.
Is your birth date same in all year ?
I have a doubt. I learnt that Earth not exactly revolve the sun in 365 days. It is 365 days and 6 hours. May be the birth date can be changed right ? If your born on January 1st in morning 6 o clock 2004, and in next year your age will change January 1st in after noon 12 o clock. So it is adding 6 hours. After four years 2008, the birth date must changed on January 2nd. The life span of man enjoy the birthday in different dates and it can only take 2 months !
Your birthday doesn't change in the long run. Those 6 'extra' hours per year are what makes an extra 24 hours i.e. an extra day in a leap year every 4 years. That is why we have that extra day in our calendars every four years so that we kinda 'get back to where we started' and to get back in sync in our revolution around the sun.
but the extra day makes the year correct, but our birth date sure change to next day, if we born after february. also leap year is just kept by scientis to not to confuse, but earth always revolves its sun same!
what happens is that a revolution takes 365 days and 1/4 so that's how leap year happens it syncs up the calendar so its not like that
LotusStream OceanMermaid what a assom
My teacher lied about this
@oonaboona That's God's idea! Pretty smart, huh?
In the winter, the northern half of the Earth is moved from the sun "only" about 800 km., given the "alleged" distance of the Sun from the Earth (149,598,262 km), so much difference in heat and power of the sun can not be.
Absurd!
Impossible!
The winter sun is at a much shallower angle in the sky than in summer. The result is that a given amount of sunlight striking an area on earth is spread out over a larger area. Easy to replicate this at home.
What boring comment. Comments like this put me to sleep.
@moviemak3r678...My teacher made me for astronomy class.
right.i have 2 watch at school