Posted 06 July 2007 - 10:11 AM
Posted 27 August 2007 - 07:47 PM
You may be able to find information on this "theory" if you do some research in Astrology. This is also the same people who believe you shouldn't make any financial decisions when Saturn is in retrograde.
If you understand where I am coming from then you probably understand why no one on an Astronomy forum has answered your question. It is not Science! \
Posted 27 August 2007 - 09:34 PM
Let's try it with numbers:
Why would the alignment be of concern?
Since it's a black hole, the only distant effect is due to its gravity.
So how would the alignment affect us, compared to other things we may
align with more frequently, such as Jupiter or the Moon?
For ease of calculation, i'm going to use the upper estimate of the central
black hole: 3 million solar masses.
The center of the galaxy is about 30,000 light years away, which is about
1,897,170,000 astronomical units (AU), one AU being the earth/sun distance.
Gravitational effects fall off at a distance-squared ratio, so if you're
twice as far away, you're only feeling 1/4th the gravitational acceleration.
So the 3 million "suns" of the black hole will see their gravitation effect
reduced by 1.8 billion times 1.8 billion (which is one divided by
3,599,254,008,900,000,000 (3.6 billion billion)) or (2.8 times 10 to the minus 19)
Multiplying that times the 3 million solar masses makes the central black
hole have 3/3.6 (million/(billion billion)) or 8.3 times 10 to the minus 13
the effect of the sun's gravity on earth.
The sun's mass is about 333000 that of the earth.
Now let's look at Jupiter... it has about 318 times the earth's mass,
or about 0.00095 that of the sun. But it's only 5 AU from us (this
month), so we have to multiply that mass by 1/25th, which yields
0.000038 the sun's gravitational effect. Or 3.8 times 10 to the minus five.
Compared to the central black hole, Jupiter has
(3.9 e-5 / 8.3 e-13) or 4.7 times 10 to the 7th, or 47,000,000 times
the gravitional effect upon us than the center of the galaxy.
And we line up between the sun and Jupiter every year (at "opposition").
I'll leave it as an exercise for the reader to do the same calculation
to find the Moon's gravitational effect upon us, compared to both
Jupiter and the black hole. As a hint, though, remember that the Moon
can raise the tides, and Jupiter has not quite that much visible effect.
Tonight will be a total lunar eclipse... which only happens when the
moon is -exactly- aligned with us and the sun, with the earth in between.
I don't expect the magnetic poles to flip over it, though.
Posted 08 October 2007 - 03:37 PM
Posted 25 January 2008 - 02:38 PM
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