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boann is offline boann
Princess
ice queen colorado
Sep 2000
time: 22:19
  Old Post 06-07-2005 02:22
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mars spectacular Help yourself to an AD-FREE life

> MARS SPECTACULAR!
>
> The Red Planet is about to be spectacular! This
> month and next, Earth is catching up with Mars in an
> encounter that will culminate in the closest
> approach between the two planets in recorded
> history. The next time Mars may come this close is
> in 2287. Due to the way Jupiter's gravity tugs on
> Mars and perturbs its orbit, astronomers can only be
> certain that Mars has not come this close to Earth
> in the Last 5,000 years, but it may be as long as
> 60,000 years before it happens again.
>
> The encounter will culminate on August 27th when
> Mars comes to within 34,649,589 miles of Earth and
> will be (next to the moon) the brightest object in
> the night sky. It will attain a magnitude of -2.9
> and will appear 25.11 arc seconds wide. At a modest
> 75-power magnification
>
> Mars will look as large as the full moon to the
> naked eye. Mars will be easy to spot. At the
> beginning of August it will rise in the east at
> 10p.m. and
> reach its azimuth at about 3 a.m.
>
> By the end of August when the two planets are
> closest, Mars will rise at nightfall and reach its
> highest point in the sky at 12:30a.m. That's pretty
> convenient to see something that no human being has
> seen in recorded history. So, mark your calendar at
> the beginning of August to see Mars grow
> progressively brighter and brighter throughout the
> month.

Japher is offline Japher
Prince
Ook! Ook! Ack! Ack! Ack!
Jun 2002
time: 05:19
  Old Post 06-07-2005 02:26
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quote:
Mars will look as large as the full moon to the
> naked eye.


I don't believe it

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 02:27
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That would play hell with tides.

boann is offline boann
Princess
ice queen colorado
Sep 2000
time: 22:19
  Old Post 06-07-2005 02:30
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quote:
Originally posted by Japher


I don't believe it



really

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 02:37
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Actually, maybe not. The acceleration due to Mars at that distance would be only about a tenth of that due to the moon...

Ecthy is offline Ecthy
Emperor
Zhonghuà Rénmín Gònghéguó
Mar 2000
time: 06:19
  Old Post 06-07-2005 02:44
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Wait. In 2003, on exactly that day August 27, it was the closest that year. How can it be exactly the same date this year again? Coincidence? OR did boann dig out an old article?

Jonny is offline Jonny
Emperor
Nashville, Tennessee, USA
Nov 2000
time: 23:19
  Old Post 06-07-2005 02:50
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quote:
Originally posted by Ecthelion
Wait. In 2003, on exactly that day August 27, it was the closest that year. How can it be exactly the same date this year again? Coincidence? OR did boann dig out an old article?


Indeed. I believe this is old news.

boann is offline boann
Princess
ice queen colorado
Sep 2000
time: 22:19
  Old Post 06-07-2005 03:08
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quote:
Originally posted by Ecthelion
Wait. In 2003, on exactly that day August 27, it was the closest that year. How can it be exactly the same date this year again? Coincidence? OR did boann dig out an old article?


you're right ecthelion...


Origins: The piece quoted above is another example of an item that was once true but is now being circulated again, long after the events it describes have come to pass. This article was relevant back in 2003, but it is not applicable now, two years later.

Mars did make an extraordinarily close approach to Earth which culminated on 27 August 2003, when the red planet came within 35 million miles (or 56 million kilometers) of Earth, its nearest approach to us in almost 60,000 years. At that time, Mars appeared approximately 6 times larger and 85 times brighter in the sky than it does ordinarily. (The message quoted above was often reproduced with an unfortunate line break in the middle of the second sentence of the second paragraph, leaving some readers with the mistaken impression that Mars would "look as large as the full moon to the naked eye" and not realizing that the statement only applied to those using viewing Mars through a scope with 75-power magnification.)

Although Mars' proximity to Earth in August 2003 (referred to as a perihelic opposition) was a rare occurrence, the red planet comes almost as near to us every 15 to 17 years. To the unaided observer, Mars' appearance in August 2003 wasn't significantly larger or brighter than it is during those much more common intervals of closeness.

Mars will have another close encounter with Earth in in 2005, but that occurrence will take place in October (not August), and the red planet will appear about 20% smaller than it did during similar circumstances in 2003.

Ecthy is offline Ecthy
Emperor
Zhonghuà Rénmín Gònghéguó
Mar 2000
time: 06:19
  Old Post 06-07-2005 03:30
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It's not like I'm an expert on astronomy, but I should remember the day that I met my ex

DRoseDARs is offline DRoseDARs

Prince
"My god, it's full of peas..."
Jul 2002
time: 21:19
  Old Post 06-07-2005 03:54
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quote:
Originally posted by Japher
I don't believe it


Boann really ought to have done a better job of posting the article...

How that sentence should have read:
quote:
At a modest 75-power magnification Mars will look as large as the full moon to the naked eye.

boann is offline boann
Princess
ice queen colorado
Sep 2000
time: 22:19
  Old Post 06-07-2005 04:09
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quote:
Originally posted by DRoseDARs


Boann really ought to have done a better job of posting the article...

How that sentence should have read:




hehehe... well thats how it came to me in an email.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 04:10 Visit KrazyHorse's homepage!
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quote:
Originally posted by Kuciwalker
Actually, maybe not. The acceleration due to Mars at that distance would be only about a tenth of that due to the moon...


wrong.

DRoseDARs is offline DRoseDARs

Prince
"My god, it's full of peas..."
Jul 2002
time: 21:19
  Old Post 06-07-2005 04:17
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quote:
Originally posted by boann
hehehe... well thats how it came to me in an email.


Not an acceptable excuse for negligence on your part...

reds4ever is offline reds4ever
Prince
of the Spion Kop
Mar 2001
time: 05:19
  Old Post 06-07-2005 04:27
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Inflate your Upload Space

It's called 'opposition' and it happens every two years, the actual distance makes a minimal difference to what you can observe through a telescope.

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 05:15
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quote:
Originally posted by KrazyHorse
wrong.


You're right, I must've dropped a digit or something. The Moon has half the diameter of Mars, so Mars' gravity would be one-quarter that of the Moon. However, Mars has about 8 times the mass, so it would have twice the acceleration due to gravity all in all. So it would mess with the tides.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:30 Visit KrazyHorse's homepage!
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Lose 30 kilos (of popups)

Wrong again. The key isn't acceleration, but gradient of acceleration.

Which is why the sun gravitates more strongly on the earth than the moon does, yet has a smaller effect on tides.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:33 Visit KrazyHorse's homepage!
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Suffering from ads?

Anyhow, who needs a calculator or figures? Assuming a relatively equal density between the moon and mars, and a first order expansion in the apparent radius of both bodies wrt radius over distance (small angle approximation) this behaviour drops out immediately.

You have much to learn, grasshopper.

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 06:34
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Got spare money?

.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:37 Visit KrazyHorse's homepage!
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Increase Your PM Length

A "thank you, master" will suffice.

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 06:38
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quote:
Originally posted by KrazyHorse
Anyhow, who needs a calculator or figures? Assuming a relatively equal density between the moon and mars, and a first order expansion in the apparent radius of both bodies wrt radius over distance (small angle approximation) this behaviour drops out immediately.

You have much to learn, grasshopper.


What does density or anything have to do with it? Mars and the moon behave roughly as point masses gravitationally, so all that matters is the mass and the distance to the earth. The gradiant of the gravitational field should fall off as 1/x^3, shouldn't it? That would put them at equal effects on the tides.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:39 Visit KrazyHorse's homepage!
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Reread my post and work it out for yourself. It allows me to solve the problem with fewer unknowns.

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:40 Visit KrazyHorse's homepage!
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You're thinking about things the brute force way. I'm doing things the elegant way.

That's why I didn't have any decimal places to drop...

KrazyHorse is offline KrazyHorse
King
Macedonia
May 2001
time: 00:19
  Old Post 06-07-2005 06:42 Visit KrazyHorse's homepage!
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Got spare money?

Didn't even need to touch pen to paper...

Kuciwalker is offline Kuciwalker
Emperor
of Schmooism
Feb 2001
time: 00:19
  Old Post 06-07-2005 06:54
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Oh, I see what you're saying.

reds4ever is offline reds4ever
Prince
of the Spion Kop
Mar 2001
time: 05:19
  Old Post 06-07-2005 07:12
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F%ck the math, try looking through a telescope!

Berzerker is offline Berzerker
Emperor
topeka, kansas,USA
May 1999
time: 23:19
  Old Post 06-07-2005 08:21
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quote:
but it is not applicable now


JohnT is offline JohnT

Emperor
Capitalist
Mar 1999
time: 00:19
  Old Post 06-07-2005 08:23
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Got spare money?

That's the date (but not year) Laura and I got married.

Ecthy is offline Ecthy
Emperor
Zhonghuà Rénmín Gònghéguó
Mar 2000
time: 06:19
  Old Post 06-07-2005 13:45
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No matter your intelligence and knowledge, KH, you're a b!tch

Az is offline Az
King
MACEDONIA - It's the name of the sovereign country to the north of Greece
Apr 2000
time: 07:19
  Old Post 06-07-2005 14:15
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Got spare money?

Luckily, the doctorants at my uni aren't behaving like a bunch of stuckup *****es like he does.

Then again, the doctorants I am hanging out with aren't physicists.

Ecthy is offline Ecthy
Emperor
Zhonghuà Rénmín Gònghéguó
Mar 2000
time: 06:19
  Old Post 07-07-2005 04:53
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Honestly, there's someone trying to use his physics knowledge and wit to explain something, and someoen else who claism to know more, maybe vene knows more, exploits the situation to behave like an asshole and play big genius. he could have just corrected him or something, but no, he acted like what he is, a prick. On a forum in the internet, too, how low can a person sink?

 
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