Australian open indoor event

[Blocker]

Let me set the record straight.

December to February is summer in Australia.

Late Jan and Feb is the hottest time of the year.

Melbourne has not had an extremely hot summer in 3 years. Three years ago the temp hit 48 degrees on a particular day and you also had bushfires blazing 3 hours away.

I may be wrong but I don't recall the closed roof policy being invoked for heat at the past 3 Opens.

Melbourne is also notorious in Australia for producing 4 seasons in a day. I've seen it hail on a nice sunny day when there wasn't a cloud in the sky. The roof was originally installed because of the rain.

Melbourne Park is set to get 2 more retractable roofs.

Australia is a country, island and a continent. We don't touch any other country, we are completely surrounded by water.

Op troll or not, there you have it.

[mib]

Originally Posted by Monsieur_DeLarge

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

I see, this is a consequence of the tides. In addition, given the same tidal force, it is much easier to phase lock the Moon to the Earth, than the Earth to the Sun since the moon has only 1% of the mass. Makes sense.

That actually suggests that eventually Earth will be phase-locked to the Sun and the seasons will disappear. In fact, now I remember reading that somewhere, perhaps some sci fi.

[diggler]

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

How can there be 7 continents and the Olympic rings have 5, allegedly one for each continent?

[PeteD]

Originally Posted by mib

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.

What on earth would change it?

[mib]

Originally Posted by PeteD

What on earth would change it?

Are serious or kidding?

[PeteD]

Wanna change the axis of the earth? Here's all it takes:

[sureshs]

Originally Posted by Blocker

We don't touch any other country, we are completely surrounded by water.

That is the case today, yes. It wasn't always like that.

[MAXXply]

[deleted post]

[woodrow1029]

Best thread ever!

[vive le beau jeu !]

Originally Posted by mib

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?

Originally Posted by PeteD

What on earth would change it?

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)



PS: please note that it might work differently in the flat earth theory.

[Desertman]

Originally Posted by vive le beau jeu !

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/...?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 !]

Originally Posted by mib

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?

Originally Posted by Monsieur_DeLarge

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...

Originally Posted by Desertman

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/...Samuel_Shenton

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

[Goosehead]

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.

[sureshs]

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

[RAFA2005RG]

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

[sureshs]

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

[PeteD]

Originally Posted by vive le beau jeu !

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]

Originally Posted by adil1972

i dont understand how its summer in australia

greatest post ever

[kishnabe]

Originally Posted by sureshs

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]

Originally Posted by kishnabe

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

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

Not sure if trolling or just canadian?