Amateur astronomy equipment, techniques, info, etc

Archive for January, 2013

Quadibloc — 12th Attempt

"Quadibloc"  wrote in message

news:b4c4e795-cfb8-4108-a14f-ed039947fb6f@10g2000yqo.googlegroups.com…

(begin quote)

At the end of Section 3 we find the transformation derived:

tau=beta(t-vx/c^2),

xi=beta(x-vt),

eta=y,

zeta=z,

where beta=1/sqrt(1-v^2/c^2).

With trivial algebraic manipulation we can derive the inverse

transformation:

t=beta(tau+v(xi)/c^2),

x=beta(xi+v(tau)),

y=eta,

z=zeta.

(end quote)

===============================================

Not only is Savard hopeless at simple algebra, he quotes the drool of some

unnamed moron who is equally hopeless.

Perhaps he can show, step-by-step, his trivial derivation, like this:

xi = beta(x-vt)

Divide both sides of the equation by beta

xi/beta =  beta(x-vt)/beta

Since beta/beta = 1,

xi/beta =  1*(x-vt)

Add  vt to both sides of the equation

xi/beta +vt  =  (x-vt)+vt

Since vt – vt = 0,

x = xi/beta +vt

Why is Savard multiplying xi by beta instead of dividing?

– This message is brought to you from the keyboard of

Lord Androcles, Zeroth Earl of Medway.

When I get my O.B.E. I’ll be an earlobe.

.
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Islam In Brief

Islam In Brief

Islam in Brief is the first part of The Fog is Lifting series of

documentaries

 challenging your knowledge about the Islamic faith and

traditions

http://www.youtube.com/profile?user=IslamInBrief#g/p

thank you

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Veins, not Flowers, on Mars

Veins, not Flowers, on Mars

- — -

> http://blogs.scientificamerican.com/life-unbounded/2013/01/18/veins-n…

> http://blogs.scientificamerican.com/life-unbounded/files/2013/01/curi…

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ASTRONOMY PICTURE OF THE DAY

http://apod.nasa.gov/apod/astropix.html

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Planetary climate spectrum

The vocabulary of ‘climate change’ doesn’t really enter the research

of an astronomer although it may for modelers interested in scaring

the wider population into paying higher taxes for no good reasonif

they are happy to pay then so well and good  but a planet’s climate is

fixed by its dynamics and fits within a spectrum.

On the basis that intelligent people who stop and dwell on the topic

for a moment and can work things out themselves without being lectured

to and gain a great satisfaction that way.The old view was that if a

planet had zero inclination it would have no seasons however this is

not entirely accurate and a much more productive assessment involves

switching the ‘no seasons’ perspective to an equatorial climate

whereas a planet with a 90 degree inclination has a polar climate.

The political system is taking advice from empirical modelers and not

astronomers and that is the real problem. Unlike the financial quants

which modeled entire countries into speculative penury,those who

traffic in astronomical/terrestrial topics are squandering

intellectual capital and undermining genuine research.

Climate research only really goes on in sci.astro.amateur as

everything else is competing models,graphs and what have you.Whatever

short term gain a politician may gain by promoting speculative

modeling instead of supporting interpretative research,the real losers

are students and people who really wish to read the climate history of

the planet through geological and biological evolution.

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Quadibloc — 13th Attempt

"Quadibloc"  wrote in message

news:b4c4e795-cfb8-4108-a14f-ed039947fb6f@10g2000yqo.googlegroups.com…

(begin quote)

At the end of Section 3 we find the transformation derived:

tau=beta(t-vx/c^2),

xi=beta(x-vt),

eta=y,

zeta=z,

where beta=1/sqrt(1-v^2/c^2).

With trivial algebraic manipulation we can derive the inverse

transformation:

t=beta(tau+v(xi)/c^2),

x=beta(xi+v(tau)),

y=eta,

z=zeta.

(end quote)

===============================================

Not only is Savard hopeless at simple algebra, he quotes the drool of some

unnamed moron who is equally hopeless.

Perhaps he can show, step-by-step, his trivial derivation, like this:

xi = beta(x-vt)

Divide both sides of the equation by beta

xi/beta =  beta(x-vt)/beta

Since beta/beta = 1,

xi/beta =  1*(x-vt)

Add  vt to both sides of the equation

xi/beta +vt  =  (x-vt)+vt

Since vt – vt = 0,

x = xi/beta +vt

Why is Savard multiplying xi by beta instead of dividing?

– This message is brought to you from the keyboard of

Lord Androcles, Zeroth Earl of Medway.

When I get my O.B.E. I’ll be an earlobe.

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NASA to get new plutonium produced in U.S.

Nice to see them doing something right for a change.

DEPARTMENT OF ENERGY

Plutonium-238 Production for Radioisotope Power Systems for

National Aeronautics and Space Administration and National Security

Missions

AGENCY: Department of Energy.

ACTION: Notice of Intent to Prepare a Supplement Analysis; Notice of

Cancellation of an Environmental Impact Statement.

———————————————————————–

SUMMARY: The Department of Energy (DOE) issued the Programmatic

Environmental Impact Statement for Accomplishing Expanded Civilian

Nuclear Energy Research and Development and Isotope Production

Missions

in the United States, Including the Role of the Fast Flux Test

Facility

(Nuclear Infrastructure or NI PEIS) in December 2000 to evaluate

alternatives for enhancement of DOE’s nuclear infrastructure. After

considering the analysis in the NI PEIS and other relevant factors,

DOE

decided to reestablish domestic production of plutonium-238 (Pu-238)

for radioisotope power systems (RPSs) to support the National

Aeronautics and Space Administration (NASA) and national security

missions.

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Female Ejaculation Riding Reverse Cowgirl and Cunnilingus

 Female Ejaculation Riding Reverse Cowgirl and Cunnilingus   http://t.co/x5DnaxY3

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Bill Owen — Fourth Attempt + 1 patient week

"Bill Owen"  wrote in message news:kd2djc$ods$1@news.jpl.nasa.gov…

Lord Androcles, Zeroth Earl of Medway wrote:

- — -

> "Bill Owen"  wrote in message news:kd1hm6$fid$1@news.jpl.nasa.gov…

> Please be patient … I didn’t get a chance to check the newsgroup over

> the weekend.  More below.

> Lord Androcles, Zeroth Earl of Medway wrote:

>> "Bill Owen"  wrote in message news:kcnq4b$pua$1@news.jpl.nasa.gov…

>> [snip]

>>> Why is Savard multiplying xi by beta instead of dividing?

>> Because the expression on the right-hand side uses tau, not t.  It’s

>> certainly true that x = xi/beta + vt.

>> Here’s the trivial derivation.

>> 1) Solve tau = beta(t-vx/c^2) for t:

>>   t = (tau/beta) + vx/c^2.

>> 2) Multiply both sides by v:

>>   vt = (v tau)/beta + (v^2c^2) x.

>> 3) Solve xi = beta(x-vt) for (vt):

>>   vt = x – xi/beta.

>> 4) Equate the right-hand sides of (2) and (3):

>>   (v tau)/beta + (v^2/c^2) x = x – xi/beta.

>> 5) Solve for x:

>>   (v tau)/beta + xi/beta = x – (v^2/c^2) x

>>                          = (1 – v^2/c^2) x

>>                          = x / beta^2

>> 6) Multiply both sides by beta^2:

>>   beta(v tau + xi) = x

>> which is half of the inverse transformation.  Solve for t in terms of xi

>> and tau similarly, by solving the equations for xi(x,t) and tau(x,t) for

>> x, equating the two expressions for x, and solving for t.  The result is

>>   t = beta (tau + v xi/c^2).

>> ================================================================

>> v = x/t, so

>> t = beta (tau + x/t  xi/c^2).

>> Incomplete, you still have 1/t on the RHS, Compo.

>> "Because the expression on the right-hand side uses tau, not t. " — Bill

>> Owen, above.

>> v = dx/dt (which can be integrated to x plus a constant) and since v is a

>> constant too we have v = x/t anywhere on the x-axis.

>> This the velocity of the train/ship/plane/car in the Earth’s Euclidean

>> coordinate system.

>> Unfortunately for you the velocity of Earth anywhere on the xi-axis of

>> the

>> vehicle’s coordinate system is upsilon = dxi/dtau = xi/tau and upsilon

>> does

>> not equal v.

>> To demonstrate, let v = 0.866c so that beta = 1/sqrt(1-0.866^2) = 2

>> Choosing x = 0.866, we have t = 1 for simplicity.

>> Hence tau = t * sqrt(1-0.866^2) = 0.5

>> xi = beta(0.866 – 0.866*1) = 0, the Earth is at the origin of the

>> vehicle’s

>> coordinate system at tau = 0.5, so it must have been at beta(0-vt) at tau

>> =

>> 0 and travelled a distance dxi = 0-upsilon.tau in time dtau = 0.5-0 with

>> velocity upsilon = xi/tau  = 1.732/0.5 = 3.464c

>> Perhaps you can explain how the Earth exceeds the speed of light in the

>> frame of the vehicle, but I’m certainly not going to accept yours or

>> Savard’s ASSUMPTION that upsilon = v when length x<xi  and time t> tau,

>> that way lies insanity.

>> So why is Savard multiplying xi by beta instead of dividing?

>> Answer:  To deliberately obfuscate and pretend he’s slick, the

>> contemptible

>> arrogant bastard.

>> — This message is brought to you from the keyboard of

>> Lord Androcles, Zeroth Earl of Medway.

>> When I get my O.B.E. I’ll be an earlobe.

>> P.S. Kelleher, you’re welcome.

> I’ll have to think about this a bit more, but I *suspect* that you may

> be confusing v — the relative velocity of the two coordinate systems —
>  with the velocity of an object as measured in one or the other of the

> coordinate systems.  The latter is indeed dx/dt or dxi/dtau, but that’s

> not necessarily the same as v.

> BTW, my earlier post was pure algebra, showing how one can take two

> equations tau(x,t) and xi(x,t) and invert them to get t(xi,tau) and

> x(xi,tau).  That’s straightforward, and the math holds regardless of the

> meaning behind the symbols.

> =======================================================

> You’ll have to think about this a bit more, but I *suspect* that you may

> be

> confusing v, the velocity of a point travelling a distance from zero to x

> in

> duration t with upsilon, the velocity of a point travelling a distance

> from

> (omega  - xi) to omega in duration tau, which is definitely not the same

> as

> |v| in relativistic drivel but is the same in the real world.

> zero(0)——————–>x  velocity v = x/t

> xi<—————-omega(0)  velocity upsilon = xi/tau

> I refer you to

> http://www.fourmilab.ch/etexts/einstein/specrel/www/

> There is no tau(x,t) or xi(x,t) in Einstein’s inequalities, perhaps you

> mean

> tau(x’,t) and xi(x’,t) where x’ = x-vt.

> In particular, I refer to the inequality

> http://www.fourmilab.ch/etexts/einstein/specrel/www/figures/img22.gif

> You’ll have to think about this a bit more, without the "but".

> — This message is brought to you from the keyboard of

> Lord Androcles, Zeroth Earl of Medway.

> When I get my O.B.E. I’ll be an earlobe.

> — Bill

> P.S.  I see that I accidentally omitted a slash in step 2 of my earlier

> post.  Obviously the last term should have been (v^2/c^2) x.

> ============================================

> Fair enough.

Wholeheartedly agreed that I’ll have to do some more thinking.  It’s

been over 20 years since I’ve done any coursework in relativity (either

special or general) and as an astrometrist I don’t often need to use it.

  For my JPL colleagues who do radio navigation it’s an entirely

different story.

So again I will ask for your patience while I try to find the time to

get the dust off the textbooks, not to mention the neurons.

– Bill

=====================================================

It’s been over 40 years for me, Bill, and over twenty five years (1987)

since I discovered why stars vary in intensity, so I have a great deal of

patience for those with intelligence and an open mind but little patience

for bigots like Savard who think they know it all but can’t do the math.

My mathematical model reproduces this curve as well as that of eclipsing

variables and cepheids, all of which have a common cause.

http://www.britastro.org/vss/gifc/00918-ck.gif

You could call it a follow up to Swan Leavitt’s work.

The point is, if the star is a constant emitter and moves in an elliptical

orbit as per Kepler, and if space has no properties, then the star varies in

intensity with the period of its orbit.

– This message is brought to you from the keyboard of

Lord Androcles, Zeroth Earl of Medway.

When I get my O.B.E. I’ll be an earlobe.

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Aurora Alert

   The disturbance from a solar event on the 15th of Jan should

   reach Earth early on the 17th GMT.  This means aurora watchers

   in North America should see activity on the night of the

   17/18 Jan.

   Go to http://www.gi.alaska.edu/AuroraForecast/

   and watch the short term forcast for activity in your region.

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