Australian open indoor event

Desertman · Nov 14, 2012

vive le beau jeu ! said:
The radius of the sun's orbit around the Earth's axis symmetry varies throughout the year, being smallest when summer is in the northern annulus and largest when it is summer in the southern annulus.

from: http://theflatearthsociety.org/wiki/index.php?title=Seasons

The Earth actually goes round the Sun

The axial tilt of the Earth is fixed at around 23 degrees and has a far greater contribution to the seasons than does the variation in the Earth's orbit around the Sun.

vive le beau jeu ! · Nov 14, 2012

mib said:
I was just pointing out that while nearly everyone knows that the seasons are switched between the hemispheres, the actual physical explanation of that is not that trivial.

For instance, why does the axis of the rotation not change with respect to the orbital plane? I think this is a result of some gyroscopic effect, but I am not sure.

Take the Moon, for example. It is phase-locked with the Earth -- we never see "the dark side" (it is not really always dark, of course). Why does not the same thing happen with the Earth with respect to the sun?

Monsieur_DeLarge said:
Tidal locking is a consequence of distance, the bodies' masses, and time. Although the moon is much smaller than the sun, its closer proximity means it exerts a greater tidal influence overall (about 2.5x greater, as far as I remember), so the moon has been locked to the earth first.

Regards,
MDL

Mr.DL explained it well.

you've got a kinda intermediary example with mercury, which is not tidally locked with the sun, but has instead a 3:2 spin-orbit resonance with the sun (rotates 3 times around its axis while making 2 revolutions around the sun... the mercurial day being longer than the mercurial year).

another interesting example is pluto-charon which are always "face-to-face" (both tidally locked to each other).

but i'm afraid that might be a bit too much of information in a short time for the OP...

Desertman said:
The Earth actually goes round the Sun

The axial tilt of the Earth is fixed at around 23 degrees and has a far greater contribution to the seasons than does the variation in the Earth's orbit around the Sun.

another funny thing in the flat earth stuff is what they say about satellites:

"Despite the fact that in October 1957 the Soviet Union launched Sputnik, the world's first artificial satellite, Shenton proved a popular speaker to small groups, enjoying particularly talking to children, never declining an invitation. He claimed that satellites simply circled over a flat disc-world: "Would sailing round the Isle of Wight prove that it were spherical?", he demanded."

from: http://theflatearthsociety.org/wiki/index.php?title=Samuel_Shenton

now if someone still has this "not sure if serious" picture...

Goosehead · Nov 14, 2012

thw world is flat,

how can we tell ?...well...

if the world was round then rafa's bottles, all neat in a line under his chair courtside would fall over wouldnt they ?

his bottles do not fall over because..DURRR...THE WORLD IS F L A T. :roll::twisted:

sureshs · Nov 14, 2012

The earth is not flat but the world is flat. What we experience is a 2D membrane wrapped on a 3D sphere.

RAFA2005RG · Nov 14, 2012

Australia is the biggest island in the world.
Australia is the smallest continent in the world.

sureshs · Nov 14, 2012

Australia is the only continent with kangaroos and whatever that flightless bird is called.

PeteD · Nov 14, 2012

vive le beau jeu ! said:
actually it does change a bit... you've got 2 variations:
- precession (rotation of the earth's rotation axis around another axis, perpendicular to the ecliptic plane, with a period of ~26000 years)
- nutation (short-term 'oscillations' of the earth's rotation axis, the largest component having a period of ~18.6 years)

But the Poster wanted to know why the tilt does not change. Precession does not change it relative to orbit (? almost flunked physics) and nutation, only minutely. To change the earth's tilt will require the same thing that created it:

When that happens, we will cease worrying about Nadal's knees, Federer's reflexes, Djokovic's grin, and the location of Murray's watch.

rafafan20 · Nov 14, 2012

adil1972 said:
i dont understand how its summer in australia

greatest post ever

kishnabe · Nov 14, 2012

sureshs said:
Australia is the only continent with kangaroos and whatever that flightless bird is called.

They are called Marsupials.....divergent evolution.

Nice to see a thread without trolling about top 4 players.

The Bawss · Nov 14, 2012

kishnabe said:
They are called Marsupials.....divergent evolution.

Nice to see a thread without trolling about top 4 players.

Not sure if trolling or just canadian?

timnz · Nov 14, 2012

diggler said:
If Australia is downunder, what does that make New Zealand?

7 continents and the Olympic rings have 5, allegedly one for each continent?

New Zealand has pride of place!

Signed

Tim from Auckland, New Zealand

pvaudio · Nov 14, 2012

mib said:
This is a fine explanation but misses one key point -- that the tilt of the rotation axis to the plane of the Earth orbit does not change as Earth goes around the sun. In any case, while not too complicated, I doubt most people would be able to produce this explanation right away.

No, you were just trolling.

vive le beau jeu ! · Nov 14, 2012

Goosehead said:
thw world is flat,

how can we tell ?...well...

if the world was round then rafa's bottles, all neat in a line under his chair courtside would fall over wouldnt they ?

his bottles do not fall over because..DURRR...THE WORLD IS F L A T. :roll::twisted:

- hombre, for the 36th time... you see: the rotation axis of the planet is inclined, and that's why you've got the clay season in june and the indoor season in december, and all that stuff...

- and that's why i got rosoled, tio ?...
<silence>
... can i eat this yellow apple ?

Mainad · Nov 14, 2012

vive le beau jeu ! said:

Tio Toni: " Rafa, your 6 month silent ban is almost up, no? You have to get your tennis racquet out and start hitting this ball again, no? We are down to our last 10 million dollars, no?!"

Rafa: " Please don't make me Tio. I no like those yellow balls anymore. I prefer those little white ones you can hit with long stick that go up and down hills and land in little hole with flag. I can make us more money if I can do that instead, no?"

vive le beau jeu ! · Nov 14, 2012

Las aventuras de tio listillo y sobrino tontito, 2ndo episodio

- emmm tio, about the topspin axis of the tierra batida, i'm not sure to...
- pero how many freaking times do you want me to explain you that ???

- but... can i now remove my hand from the frying pan, tio ?

mib · Nov 16, 2012

vive le beau jeu ! said:
Mr.DL explained it well.

you've got a kinda intermediary example with mercury, which is not tidally locked with the sun, but has instead a 3:2 spin-orbit resonance with the sun (rotates 3 times around its axis while making 2 revolutions around the sun... the mercurial day being longer than the mercurial year).

another interesting example is pluto-charon which are always "face-to-face" (both tidally locked to each other).

but i'm afraid that might be a bit too much of information in a short time for the OP...

another funny thing in the flat earth stuff is what they say about satellites:

from: http://theflatearthsociety.org/wiki/index.php?title=Samuel_Shenton

now if someone still has this "not sure if serious" picture...

Thanks, pretty interesting! Things to think about while tennis is on hold

Australian open indoor event

Desertman

Hall of Fame

vive le beau jeu !

Talk Tennis Guru

Goosehead

Legend

sureshs

Bionic Poster

RAFA2005RG

Banned

sureshs

Bionic Poster

PeteD

Legend

rafafan20

Professional

kishnabe

Talk Tennis Guru

The Bawss

Banned

timnz

Legend

pvaudio

Legend

vive le beau jeu !

Talk Tennis Guru

Mainad

Bionic Poster

vive le beau jeu !

Talk Tennis Guru

mib

New User

Similar threads