# Rotation of the sun

Discussion in 'Astronomy, Exobiology, & Cosmology' started by timojin, Jan 12, 2016.

1. ### timojinValued Senior Member

Messages:
3,252
Does the sun gives the same intensity of light to the earth as it rotates ?

ajanta likes this.

3. ### AlexGLike nailing Jello to a treeValued Senior Member

Messages:
4,304
At night the dark side of the sun is facing the earth. That's why it's dark.

Confused2, ajanta, zgmc and 2 others like this.

5. ### timojinValued Senior Member

Messages:
3,252
Are you a wise guy? very funny .

Messages:
26,447
I could have asked you the very same thing in the other thread.

Messages:
26,447
Why wouldn't the Sun not give the same Intensity of light as it rotated?
And let me add now, the Sun does not rotate as a sphere.At the Equator it makes a rotation about every 25 days: At the poles, it takes around 35 days.
And of course the intensity of the light we receive on earth, is a result of the Earth's axial tilt.

9. ### The GodValued Senior Member

Messages:
3,546
Mods, please correct the 'Ritation' in the title of OP...

This is a simple looking yet interesting question.....

What basically the OP is asking if the energy received by the earth from the sun is same as the sun rotates....although its a very small fraction, still its worth the basic details..

To start with we will make few assumptions, detailed discussion will involve few more parameters...

1. Energy output of Sun as constant.
2. The minimum distamce between Sun - Earth around 1.47 mKm, and maximum at 1.52 mKm.
3. Earth face as half towards Sun on any giving point.

Whatever Sun's energy is being emitted, it is passing through a sphere on whose outer surface earth can be considered, for example when the distance between the Sun & earth is 1.47 mKm, the entire energy as received by the earth shall be proportional to (approximately, without considering the tilt of the earth) ......0.5 X Surface Area of earth / Surface area of the sphere of 1.47 mKm, when the earth is farthest away from the sun, the denominator shall change to 1.52 mKm, so as the sun rotates, the energy rate per unit area of the earth changes.....

ajanta likes this.
10. ### timojinValued Senior Member

Messages:
3,252
Well, does the sun have a homogeneous surface on its spherical appearance ? I assume not, because from some spot there are intensive flare coming out . For some reason about every 11 years there are some more intensive burst
Why at the poles have a faster rotation ? does that indicates the sun is composed of discs.
If the rotation of the sun would be 30 or 31 days we would be synchronized and we would see only same face

11. ### rpennerFully WiredValued Senior Member

Messages:
4,833
Why? The poster repeatedly demonstrates he doesn't have or doesn't care about basic education.
Case in point. He fails to correctly state the period in which the Earth revolves about the sun and is off by an order of magnitude. Likewise he fails to research the topic of discussion on his own and doesn't know what solar phenomena allows us to know that its visible surface rotates at different rates.

12. ### Janus58Valued Senior Member

Messages:
2,157
The different surface features of the Sun are not permanent fixtures but transient. Sun spots and solar flares come and go at different regions and different times. The 11 year cycle follows the periodic change in the occurance of these features
No, just that the Sun is a gaseous body with no rigid structure.
30 and 31 days are the length of calendar months which were chosen so that we would have 12 months in a year. They are somewhat based on the synodic month (full moon to full moon) which is 29.53059 days but are not directly tied to any astronomical event.
But the month (neither calendar nor synodic) has any bearing on what side of the Sun we see. In order for us to see just one side of the Sun, it would have to rotate once every sidereal year(365.25636 days).

nebel likes this.
13. ### trevor borocz johnsonRegistered Senior Member

Messages:
251
The explosive force of the sun's fusion pushing out against it's gravity pulling in is what gives the sun it's shape. Why would it differ in it's symmetry of core and convection if that process of fusion kept its perfectly spherical shape. Except for mountains of gas waves but I'm suspicious someone planted those in the telescope.

14. ### timojinValued Senior Member

Messages:
3,252
Well since I am uneducated and you are . Tell me does the sun have liquid or solid phase with in the star ? But avoid hand waving . From what phase the flare come out.

reppner , don't overestimate yourself, You have thrown in my face your Phd . I have worked with some of you ,kind , and I come to conclusion that sheepskin is just a cover so individuals would not ask deeper question. I don't know if you are one of them.

Last edited: Jan 12, 2016
15. ### originHeading towards oblivionValued Senior Member

Messages:
11,092
This would take approximately 30 seconds to find out on google. The answer is the star is made up of plasma, so it is not solid or liquid.

16. ### sculptorValued Senior Member

Messages:
7,026
You assume right.
The sun is not homogeneous.
The surface is constantly changing.
One day, the sun may show us a stormy(correlates well with sun spots) side which gives off much more radiation. On another day, we may have the calmer side.
The sun was very stormy(grand solar maximum) the last 1/2 of the last century and gave us much more energy than average. 300 years ago the sun was very calm(few sun spots) and gave us much less energy than average.

Last edited: Jan 12, 2016

Messages:
26,447
In your case, you ignore any and all scientific explanations and even fact:
The Sun is a ball of Plasma and really nothing too mysterious about it at all, other than the temperature at the corona as compared to the surface, although an explanation of that is reasonably valid.
The Sun and the other stars [yes my Son, the Sun is just another star!] were not created by any magical hand of any magical deity, but came about due to intense and violent gravitational collapse and the extremes of temperatures and pressures created.
And further more, everything you are made of, every atom in your body and mine, and rpenner's, came about through these stars finally ending their lives, the most violent being in Supernova explosions.
In essence, we are all nothing but star dust!

18. ### originHeading towards oblivionValued Senior Member

Messages:
11,092
I think you meant every atom heavier than Lithium came from stars.

Messages:
26,447
In essence the following post is much ado about nothing, prompted by our friend in his usual efforts to project some "learning and sophistication" [

] and it also contains some errors.
No assumptions needed:Just some well known facts.
The Sun does have a pulsation of sorts where variations in intensity do occur: These variations are tiny, less than .1% over an approximate 11 year cycle.
As anyone with some astronomical knowledge would notice, that 11 year cycle, corresponds with sunspot intensities also.
This tiny change in intensity though has nothing to do with any rotational parameter as asked in the OP.
As stated in post 5, the intensity of heat from the Sun to the Earth's surface, is overwhelmingly dictated by the Earth's tilt. This is made obvious by the fact that perhelion occurs at around Jan 3rd, and Aphelion around July 4th.
I'm sure our Northern hemisphere friends can see the apparent contradiction if the orbital parameter of the Earth contributed anything towards heat intensity we receive.

Well, ummmm, why would you even mention such a thing?
I mean how can it ever be otherwise?

The energy rate changes because the Earth orbits, nothing to do with any rotational aspect of the Sun.

Wow!!

In summing, and as detailed in post 5
[1] The intensity of heat received from the Sun has nothing to do with the rotation of the Sun.
[2]The variations in temperatures on Earth are due to the Earth's tilt and very little with the earth's orbital parameter.
[3] The "energy rate" received on Earth's surface at anyone time, has nothing to do with the Sun's rotation.

Last edited: Jan 12, 2016

Messages:
26,447

Yes, thank you most certainly.

Messages:
26,447
It has nothing to do with rotation of the Sun.

The Sun is a plasma, and really, the disc question is silly.
No: If I understand you correctly, the Earth rotates once every 24 hrs and takes 365.25 days to orbit: How can there be any synchronisation.
The Moon for instance, rotates on its axis in approx 27 days, and also 27 days to orbit earth.

22. ### timojinValued Senior Member

Messages:
3,252
You and I and us are not dust we are organism we absorb energy , use it observe the stars , we imagine how they are formed . Remember who said " I am alive because I can think , and a dust is a dust , and if one like you and me don't pick it up and modify it it will be a dust. The Creator have intelligence and he had shared with us . And we continue creating and modifying nature for our better living.