Transit of Venus

Paul Schlyter wrote:




Check out the images of the Venus transit he

http://vt-2004.kva.astro.su.se/

In particular, check the iamge taken at 11:07 UT --- no black drop
visible there.

I don't see any teardrops either. Must be an artifact of the human eye.
I don't think
any pro astronomers ever look thru a telescope to do any real science
anymore.
And if they did, it's probably just to make sure the scope is ready to
photograph
it.


These images were taken with the 1-meter Swedish Solar Telescope at
La Palma. Canary Islands. This telescope produces the sharpest
solar images in the world.

Also check the 11:12 and 11:15 UT images carefully: there you can see
another phenomenon although faintly: the part of Venus' limb outside
the solar disk is visible, due to sunlight refracted in Venus'
atmosphere.

In article ,
Robert Casey wrote:
In particular, check the iamge taken at 11:07 UT --- no black drop
visible there.

I don't see any teardrops either. Must be an artifact of the human eye.

No, it has been photographed during transits of Mercury (which also proves
that it is not a result of Venus's atmosphere).
--
"Think outside the box -- the box isn't our friend." | Henry Spencer
-- George Herbert |

In article ,
Henry Spencer wrote:

In article ,
Robert Casey wrote:

In particular, check the iamge taken at 11:07 UT --- no black drop
visible there.

I don't see any teardrops either. Must be an artifact of the human eye.

No, it has been photographed during transits of Mercury (which also proves
that it is not a result of Venus's atmosphere).

The Black Drop is an effect of how our eyes perceive when two unsharp
edges between bright and dark approach one another. It can be readily
simulated by keeping two of your fingers as close to your eye as you can
and then let the fingers approach one another: they seem to touch before
they actually touch.

--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stockholm dot bostream dot se
WWW: http://www.stjarnhimlen.se/
http://home.tiscali.se/pausch/

"Paul Schlyter" wrote in message
...

The Black Drop is an effect of how our eyes perceive when two unsharp
edges between bright and dark approach one another. It can be readily
simulated by keeping two of your fingers as close to your eye as you can
and then let the fingers approach one another: they seem to touch before
they actually touch.

is that the same thing as seeing the drop effect in front of the sun?
somebody else explained on here, i think it was at metaresearch.org
or something, that it is due to moving cells of air in the atmosphere.

rj

randyj wrote:
"Paul Schlyter" wrote in message
...

The Black Drop is an effect of how our eyes perceive when two unsharp
edges between bright and dark approach one another. It can be
readily simulated by keeping two of your fingers as close to your
eye as you can and then let the fingers approach one another: they
seem to touch before they actually touch.

is that the same thing as seeing the drop effect in front of the sun?
somebody else explained on here, i think it was at metaresearch.org
or something, that it is due to moving cells of air in the atmosphere.

rj

I haven't read that particular explanation, but if you check what else is on
the site, it's probably a load of *****.


DaveL

In article ,
randyj wrote:

"Paul Schlyter" wrote in message
...

The Black Drop is an effect of how our eyes perceive when two unsharp
edges between bright and dark approach one another. It can be readily
simulated by keeping two of your fingers as close to your eye as you can
and then let the fingers approach one another: they seem to touch before
they actually touch.

is that the same thing as seeing the drop effect in front of the sun?
somebody else explained on here, i think it was at metaresearch.org
or something, that it is due to moving cells of air in the atmosphere.

Well, these moving cells do increase the fuzziness of the limbs of the
Sun and of Venus...



--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stockholm dot bostream dot se
WWW: http://www.stjarnhimlen.se/
http://home.tiscali.se/pausch/

In article ,
randyj wrote:
is that the same thing as seeing the drop effect in front of the sun?
somebody else explained on here, i think it was at metaresearch.org
or something, that it is due to moving cells of air in the atmosphere.

I'm not sure what it says at metaresearch.org, but since the black
drop effect was seen when Mercury transited the sun as observed by a
spacecraft, the black drop effect cannot be due to either the earths
atmosphere or the atmosphere of the planet in transit.

"Greg Hennessy" writes:

I'm not sure what it says at metaresearch.org, but since the black
drop effect was seen when Mercury transited the sun as observed by a
spacecraft, the black drop effect cannot be due to either the earth's
atmosphere or the atmosphere of the planet in transit.

I saw my first transit of Mercury and first black drop
effect in 1960. It has always been obvious that the atmosphere of the
transiting planet has nothing to do with the black drop effect because
Mercury has no atmosphere.

But think about what you are saying. Earth does have an
atmosphere, and the light from the transit must pass through it. Our
atmosphere slightly distorts all light passing through it. Why should
transits be an exception?

Lunar occultations prove that the apparent enlargement of
the Sun's and Moon's disks caused by irradiation does not occur in
space. So it must happen in Earth's atmosphere. And stellar "seeing"
disks show that it does happen here, caused by variable refraction in
moving air cells.

At the Meta Research site you will find the evidence and
details. See
http://metaresearch.org/home/viewpoint/blackdrop.asp.
Be sure not to be one of those people who can't unlearn things once
learned wrongly. Look at the evidence and draw your own conclusions
anew, without the influence of the bias of having previously held a
contrary position. -|Tom|-


Tom Van Flandern - Washington, DC - see our web site on replacement
astronomy research at http://metaresearch.org

"Tom Van Flandern" wrote in message
...
"Greg Hennessy" writes:

I'm not sure what it says at metaresearch.org, but since the black
drop effect was seen when Mercury transited the sun as observed by a
spacecraft, the black drop effect cannot be due to either the earth's
atmosphere or the atmosphere of the planet in transit.

I saw my first transit of Mercury and first black drop
effect in 1960. It has always been obvious that the atmosphere of the
transiting planet has nothing to do with the black drop effect because
Mercury has no atmosphere.

But think about what you are saying. Earth does have an
atmosphere, and the light from the transit must pass through it. Our
atmosphere slightly distorts all light passing through it. Why should
transits be an exception?

Lunar occultations prove that the apparent enlargement of
the Sun's and Moon's disks caused by irradiation does not occur in
space. So it must happen in Earth's atmosphere. And stellar "seeing"
disks show that it does happen here, caused by variable refraction in
moving air cells.

What about the spacecraft in orbit outside earth's atmosphere that
someone mentioned? It too saw the black drop effect in a Mercury
transit from outside
the atmosphere, according to whoever posted that.

rj

In article ,
Tom Van Flandern wrote:
But think about what you are saying. Earth does have an
atmosphere, and the light from the transit must pass through it. Our
atmosphere slightly distorts all light passing through it. Why should
transits be an exception?

You are proposing a logical fallacy.

Earth's atmosphere distorts light.
The black drop effect is a light distortion.
The earth's atmosphere causes the black drop effect.

The logical fallacy is because other effects besides the earths
atmosphere distort light.

If the black drop effect is from the earths atmosphere, how come the
TRACE sattelite saw the effect?