Totality Exposed

On Sun, 4 Mar 2007 14:08:21 GMT, Helen Deborah Vecht
wrote:

My partner took this shot from the back garden.

http://www.davidarditti.co.uk/luneclipse07.html

Magnificent picture. A question for the experts: why was there a
bright white sliver on the top left-hand edge of the moon during
totality? On David's picture, it extends from about 10 o'clock to
almost the top of the picture (excuse the technical language!) but, on
some others, it extends clockwise to about 1 o'clock. It was clearly
visible to the naked eye and I'm curious why it wasn't reddish, like
the rest of the image.

Mike.

--
Entia non sunt multiplicanda praeter necessitatem

On Mar 4, 9:22 pm, Mike wrote:
On Sun, 4 Mar 2007 14:08:21 GMT, Helen Deborah Vecht

wrote:
My partner took this shot from the back garden.

http://www.davidarditti.co.uk/luneclipse07.html

Magnificent picture. A question for the experts: why was there a
bright white sliver on the top left-hand edge of the moon during
totality? On David's picture, it extends from about 10 o'clock to
almost the top of the picture (excuse the technical language!) but, on
some others, it extends clockwise to about 1 o'clock. It was clearly
visible to the naked eye and I'm curious why it wasn't reddish, like
the rest of the image.

Mike.

--
Entia non sunt multiplicanda praeter necessitatem

The reply of the experts is going to be fun,I know,the Earth casts a
shadow or something like that.

Look,do this the other way around and figure it out for yourself.

Here is the moon shielding the Earth from direct solar radiation at a
solar eclipse -

http://cseligman.com/text/planets/eclipse99mir.jpg

The bright part of the moon that is not shielded by the Earth shows
up as direct solar radiation received by the moon.

Look,an astronomer takes lots and lots of things into account and can
stand back every so often and enjoy the spectacle.Everybody is an
astronomer insofar as they live by the motions of the Earth in terms
of sleeping waking habits,by the annual cycle in various different
ways but a good astronomer takes more and more details on board and
applies them with equal amounts of curiousity and common sense.

Most here unwittingly take part in an exercise that destroys the
neccessary intutive intelligence required to work with the motions of
the Earth and when common sense should intervene and correct wayward
notions,no such authority exists.HGo ahead and work things out for
yourself and you will be repaid a thousansd times the initial effort.

In article ,
=?ISO-8859-1?Q?Anders_Ekl=F6f?= wrote:

BTW Paul, is the occultation of 56 Leo worth reporting ?
Visual, with an accuracy of 1-2 seconds. It was gone for 21m30s.

No, that's not worth reporting. If you did report it to e.g. ILOC, they'd
probably discard it because of lack of accuracy.

The standard aim already a few decades ago was to report the observed
time of occultation to 0.1 seconds, and aim at a final accuracy
(including e.g. reaction time) of 0.3 seconds or better. With today's
camcorders one can (by recording the occultation on video and a radio
time signal simultaneously on the audio track) fairly easily get an
accuracy of a few hundredths of a second in the observed time of the
occultation.


I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

Actually, today you don't have to choose - you can get both in
one and the same machine, since you now can run Windows on
recent Mac's with an Intel CPU! :-)

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

Paul Schlyter wrote:


I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

Actually, today you don't have to choose - you can get both in
one and the same machine, since you now can run Windows on
recent Mac's with an Intel CPU! :-)

As you may guess, I'm well aware of that :-)

To get both in one machine you will have to choose a Mac,
so my recommendation still holds.

--
I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

In article ,
Anthony Ayiomamitis wrote:

The Greek gods expressed their anger this weekend in the most
categorical way

Probably something to with this:

http://news.bbc.co.uk/1/hi/world/europe/6285397.stm

-- Richard
--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

Richard Tobin wrote:
In article ,
Anthony Ayiomamitis wrote:


The Greek gods expressed their anger this weekend in the most
categorical way


Probably something to with this:

http://news.bbc.co.uk/1/hi/world/europe/6285397.stm

.... and I paid for their anger and the missed opportunity with the
eclipse. Here is a mosaic leading up to totality that consumed eight
hours to normalize the backgrounds between images (thin clouds, thick
clouds, dark clouds, white clouds, hazy clouds, semi-transparent etc
etc): http://www.astrovox.gr/forum/album_pic.php?pic_id=3324 ... I
promise a better result next Feb/2008 when we get another such opportunity.

Anthony.


-- Richard