RE: Urgent request.

1999-05-17 Thread Arthur Carlson

For the benefit of Tony Moss, a search on
http://bible.gospelcom.net/cgi-bin/bible in KJV for every thing
beautiful yielded:

He hath made every thing beautiful in his time: also he hath set the world
in their heart, so that no man can find out the work that God maketh from
the beginning to the end.

... Of course, the authorized version is always what the client wants.
Whether the Bible is infallible or not, the customer certainly is.

--Art Carlson


Re: a better eclipse filter

1999-05-17 Thread Dave Bell

On Mon, 17 May 1999, John Carmichael wrote:

 Hi Ross:
 
 Getting a small, very long focal length lens (or mirror) to replace the 
 pinhole
 can solve the problem, at the risk of introducing some image aberrations,
 including chromatic, visible at the edges of the solar disk.  This was of
 course used to great effect on Kitt Peak in the wonderful solar telescope
 there that I visited a few months ago.
 
 The question is one of whether you or your astronomer friends knows of an
 optical system which produces the effect of a long focal length, but with a
 much shorter distance from the optical system to the focal plane.
 
 Sounds impossible to me, but I'll ask my astronomer friends.
 
 Take care,
 
 John

Much easier than it sounds, John!  It's called a telescope, or
telephoto lens! Seriously, a simple telephoto lens is a basic Galillean
telescope. Largish, long focal length positive objective lens, and a
small, short focal length *negative* eyepiece lens. The long focal length
is mostly consumed between the objective and the eyepiece. The rays coming
out of the eye lens can be focussed on a card at any desired distance,
giving a large, well focussed image. It will of course be dimmer than the
direct sunlight, so you need to shade it like any other method. A small
spotting 'scope, half a binocular, the finder scope from a larger
instrument, or that spare telephoto lens all will work.

Dave


Re: a better eclipse filter

1999-05-17 Thread Fernando Cabral

John Carmichael wrote:

 Hi Ross:
 
 A little, off-the-wall, query.  The larger the distance from the pinhole to 
 the
 white sheet image of the sun, the larger the sun, but also the dimmer too.

 This is correct.  The sun's image becomes quite dim at the long distance
 needed to see sunspots.  This can be corrected by lowering the amount of
 ambient light as much as possible.   Providing extra shade around the whole
 setup helps. ie. use a large piece of cardboard for the pinhole, or put the
 pinhole in the bottom of a box or tube.

Why don't we re-invent the camera obscura? :-)

- fernando


 Getting a small, very long focal length lens (or mirror) to replace the 
 pinhole
 can solve the problem, at the risk of introducing some image aberrations,
 including chromatic, visible at the edges of the solar disk.  This was of
 course
 used to great effect on Kitt Peak in the wonderful solar telescope there 
 that I
 visited a few months ago.
 
 The question is one of whether you or your astronomer friends knows of an
 optical system which produces the effect of a long focal length, but with a
 much
 shorter distance from the optical system to the focal plane.

 Sounds impossible to me, but I'll ask my astronomer friends.

 Take care,

 John

 
 John Carmichael wrote:
 
  A bunch of us, including astronomers from Kitt Peak, traveled to southern
  Baja for the July 11, 1991 total eclipse.
 
 Thanks,
 
 Ross McCluney
 
 

--
Fernando Cabral Padrao iX Sistemas Abertos
mailto:[EMAIL PROTECTED]  http://www.pix.com.br
mailto:[EMAIL PROTECTED]
Fone: +55 61 321-2433   Fax: +55 61 225-3082
15º 45' 04.9 S 47º 49' 58.6 W
19º 37' 57.0 S 45º 17' 13.6 W



Multiple sunsets

1999-05-17 Thread Frank Evans

Regarding Fernando Cabral's multiple observation of sunsets at one
setting I recently wrote to the Marine Observer (British Met. Office)
concerning a meteorologist who claimed to have seen the sunset green
flash three times at one setting by climbing to successive decks of an
ocean weather ship as the sun sank.  This elicitated the following note
to the same journal (Marine Observer, April 1999) from Dr. R. J.
Livesey, Director of the Aurora Section, British Astronomical
Association, whose text I acknowledge:

I was in Holyrood Park, Edinburgh, on the lower slopes of Arthur's Seat
with a good clear sky.  The sun was setting behind the top of David Hume
tower block of Edinburgh University, which is about a mile away, when I
saw a green flash.  Realising the geometry of the situation I ran back
up the slope until the sun was again visible above the tower block.
Again as it set behind the building there was a green flash.  I was able
to repeat the phenomenon by a second run up the slope.  One was required
to move only so much as would bring the upper limb of the sun just above
the tower block to cause a repeat as the sun sank down.



-- 
Frank Evans


Re: Sundial for downed pilots

1999-05-17 Thread Jim_Cobb

Art Carlson wrote:
 That's exactly what I had in mind. This is a rule that can be easily
 understood and remembered, as opposed to remember to ADD nine hours to the
 clock time for a three-quarter moon, if it is WANING. What I would like to
 figure out is the errors involved in both methods, given orbital parameters.

[...]

 --Art Carlson

Here are some rough parameters.  The maximum deviation of the ecliptic
from the equator is 23.5 degrees.  In other words the maximum
deviation of the point where the ecliptic meets the horizon from the
true east or west compass point is 23.5 degrees.  That's where my
remarks about knowing the time of year and time of day comes in--it
gives the information about this deviation.  If you have a celestial
planisphere, it probably has markings for the ecliptic and celestial
latitude.  Give it a good examination to get a feel for how the
deviations behave over the course of a year and day.

However, the moon does not lie precisely along the ecliptic, but can
deviate from it by a maximum of about 5 degrees (I'm not certain of
that max. deviation, and I don't have my books with me).  Plus, there
will be error in tracing out the ecliptic through the sky as I first
suggested.

In sum, the procedure I gave is pretty rough.

Jim
 --- -- 
| Jim Cobb  | 540 Arapeen Dr. #100 | [EMAIL PROTECTED]  |
| Parametric| Salt Lake City, UT   | (801)-588-4632 |
|  Technology Corp. |   84108-1202 | Fax (801)-588-4650 |
 --- -- 
Through infinite mist, software reverberates
In code possess'd of invisible folly.
-- Curt Sampson


Re: Urgent request.

1999-05-17 Thread Jim_Cobb

http://bible.gospelcom.net/cgi-bin/bible?language=Englishversion=KJVpassage=Ecclesiastes+3:11matchno=7

Ecclesiastes 3:11 (English-KJV)

 He hath made every thing beautiful in his time: also he hath set the 
world in their heart, so that no
 man can find out the work that God maketh from the beginning to the 
end. 

Jim
 --- -- 
| Jim Cobb  | 540 Arapeen Dr. #100 | [EMAIL PROTECTED]  |
| Parametric| Salt Lake City, UT   | (801)-588-4632 |
|  Technology Corp. |   84108-1202 | Fax (801)-588-4650 |
 --- -- 
I have an answering machine for my phone.  Now when I'm not home and
someone calls me up they hear a recording of a busy signal.  -- Steven Wright



 Fellow Shadow Watchers,
 This is 100% on topic and somewhat urgent for me. 
  The large bronze dial plate which I am about to engrave must bear the 
 biblical inscription 
 
 He hath made every thing beautiful in his time 
 
 Can anyone give me 'chapter  verse' for this please as I must be certain 
 that I have it absolutely per the King James' version as erasers don't 
 work on bronze :-)  In particular does 'his' have a capital letter?
 
 Before now I've made a mistake in the workshop and found myself mentally 
 reaching for 'undo'.
 
 If only it were possible!
 
 Many thanks in advance.
 
 Tony Moss
 
 



Re: a better eclipse filter

1999-05-17 Thread John Carmichael

Hi Ross:

A little, off-the-wall, query.  The larger the distance from the pinhole to the
white sheet image of the sun, the larger the sun, but also the dimmer too.

This is correct.  The sun's image becomes quite dim at the long distance
needed to see sunspots.  This can be corrected by lowering the amount of
ambient light as much as possible.   Providing extra shade around the whole
setup helps. ie. use a large piece of cardboard for the pinhole, or put the
pinhole in the bottom of a box or tube.

Getting a small, very long focal length lens (or mirror) to replace the pinhole
can solve the problem, at the risk of introducing some image aberrations,
including chromatic, visible at the edges of the solar disk.  This was of
course
used to great effect on Kitt Peak in the wonderful solar telescope there that I
visited a few months ago.

The question is one of whether you or your astronomer friends knows of an
optical system which produces the effect of a long focal length, but with a
much
shorter distance from the optical system to the focal plane.

Sounds impossible to me, but I'll ask my astronomer friends.

Take care,

John


John Carmichael wrote:

 A bunch of us, including astronomers from Kitt Peak, traveled to southern
 Baja for the July 11, 1991 total eclipse.

Thanks,

Ross McCluney




Re: viewing an eclipse

1999-05-17 Thread John Schilke

Hello, All!
Several years ago we were able to see a partial solar eclipse not 
too far away from local noon.  Knowing the principal, I asked him whether 
he'd not like me to set up a viewing scheme for the grade school my 
children attended.  He agreed, and I covered all the south-facing windows 
of a class-room (it was the music room) except for a pinhole in a piece 
of aluminum foil over one pane of one window.  I put a sheet of white 
paper on a music stand some 6-8 metres away, and found a good-sized 
projected image of the sun on the sheet.  One could distinguish a few spots.
The children filed by slowly, all the time remaning somewhat 
awed.  From time to time I moved the stand to keep pace with the sun's 
motion.  It worked quite well.
One unexpected benefit, for me who became dark-adapted in the 
unlighted room, was that this was, of course, a camera obscura.  It was 
great fun to be able to see birds on the telephone wire outside -- upside 
down!
I recommend the technique as one that is simple and very 
enjoyable.  As I recall, the pinhole was only a couple of millimetres in 
diameter.
John


Re: Urgent request.

1999-05-17 Thread John Schilke

ECCLESIASTES 3:11.
John

On Mon, 17 May 1999, Tony Moss wrote:

 Fellow Shadow Watchers,
 This is 100% on topic and somewhat urgent for me. 
  The large bronze dial plate which I am about to engrave must bear the 
 biblical inscription 
 
 He hath made every thing beautiful in his time 
 
 Can anyone give me 'chapter  verse' for this please as I must be certain 
 that I have it absolutely per the King James' version as erasers don't 
 work on bronze :-)  In particular does 'his' have a capital letter?
 
 Before now I've made a mistake in the workshop and found myself mentally 
 reaching for 'undo'.
 
 If only it were possible!
 
 Many thanks in advance.
 
 Tony Moss
 
 

 


RE a better eclipse filter

1999-05-17 Thread John Shepherd

My favorite way to show eclipses and sunspots is with a reflective pin hole
camera. A small mirror, preferably front surface, about .25 to .5 inches in
diameter mounted on a camera tripod. The light from the sun is reflected
through a window into a darkened room onto a white wall or screen. Its
often possible to get images of 3 feet or more in diameter. I haven't
bothered to motorize the mirror so frequent adjustment  is necessary. The
later does, however, serve to demonstrate to non dialists that the sun
moves across the sky:-) I often put an adjustable aperture on the screen
side of the mirror to improve the resolution.

Cheers,

Professor John P.G.Shepherd
Physics Department
University of Wisconsin-River Falls
410 S. 3rd. St.
River Falls,WI 54022

Phone (715)-425-3196, eve. (715)-425-6203
Fax (715)-425-0652

44.88 degrees N, 92.71 degrees W.



Re: Multiple sunsets

1999-05-17 Thread mblackwell

One can get a similar effect riding a large ferris wheel right at sunset.
While not giving a full sunrise/sunset, it's still 
fun to watch the upper limb disappear and reappear :-)

-Original Message-
From: William P Thayer [mailto:[EMAIL PROTECTED]

I also thought something I would like to ask the airplane pilots we have
among us. Have any of you ever tried to take off immediately after the
sunset, flying straight to the sun's azimuth, trying to see several sunsets
in a raw?



Re: Urgent request.

1999-05-17 Thread Richard Langley

Ecclesiastes. Chapter 3. Verse 11.  The online versions I checked did not
capilalise his.

On Mon, 17 May 1999, Tony Moss wrote:

Fellow Shadow Watchers,
This is 100% on topic and somewhat urgent for me. 
 The large bronze dial plate which I am about to engrave must bear the 
biblical inscription 

He hath made every thing beautiful in his time 

Can anyone give me 'chapter  verse' for this please as I must be certain 
that I have it absolutely per the King James' version as erasers don't 
work on bronze :-)  In particular does 'his' have a capital letter?

Before now I've made a mistake in the workshop and found myself mentally 
reaching for 'undo'.

If only it were possible!

Many thanks in advance.

Tony Moss


   



=== 
 Richard B. LangleyE-mail: [EMAIL PROTECTED]  
 Geodetic Research Laboratory  Web: http://www.unb.ca/GGE/
 Dept. of Geodesy and Geomatics EngineeringPhone:+1 506 453-5142  
 University of New Brunswick   Fax:  +1 506 453-4943  
 Fredericton, N.B., Canada  E3B 5A3
 Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
=== 


solar filter sources

1999-05-17 Thread Richard M. Koolish

A page of solar filter sources is:

http://umbra.gsfc.nasa.gov/eclipse/970309/text/filter-sources.html


books on atmospheric phonomena

1999-05-17 Thread Richard M. Koolish

There's a page of books on atmospheric phonomena at:

http://www.treasure-troves.com/astro/AtmosphericPhenomena.html

One book that I like is:

Greenler, R.,  Rainbows, Halos, and Glories,
Cambridge University Press, 1980. 


Re: Urgent request.

1999-05-17 Thread The Shaws

Tony Moss asked
(Snip)
He hath made every thing beautiful in his time 
Can anyone give me 'chapter  verse' for this please as I
must be certain 
(Snip)

King James version of
Ecclesiastes Chapter 3 Verse 11

He hath made every thing beautiful in his time: also he
hath set the world in their heart, so that no man can find
out the work that God maketh from the beginning to the end

Mike

[EMAIL PROTECTED]
53.37N  3.02W



To those who needed info

1999-05-17 Thread Tinkler

Several months ago I volunteered to send out some jpg's of the inside covers 
of a book that I have. the pages are intitled Pocket Navigator and is a 
form of sundial, several asked for the pictures but for some unknowen reason 
I never sent them and I have lost the list of those that wanted them.

If any of you are still interested please let me know

Dave Carlson

Redding, CA. USA

P.S. The name of the book is Better ways of Pathfinding by Robert S. 
Owendoff


Urgent request.

1999-05-17 Thread Tony Moss

Fellow Shadow Watchers,
This is 100% on topic and somewhat urgent for me. 
 The large bronze dial plate which I am about to engrave must bear the 
biblical inscription 

He hath made every thing beautiful in his time 

Can anyone give me 'chapter  verse' for this please as I must be certain 
that I have it absolutely per the King James' version as erasers don't 
work on bronze :-)  In particular does 'his' have a capital letter?

Before now I've made a mistake in the workshop and found myself mentally 
reaching for 'undo'.

If only it were possible!

Many thanks in advance.

Tony Moss


   


Re: Multiple sunset

1999-05-17 Thread William P Thayer

I also thought something I would like to ask the airplane pilots we have
among
us. Have any of you ever tried to take off immediately after the sunset,

flying straight to the sun's azimuth, trying to see several sunsets in a
raw?


One of the most famous pilots in the world included a version of this in
his even more famous book. Antoine de Saint-Exupéry, in the Petit Prince,
has his title character, the Little Prince, tell him how back on his home
planet -- a very small place -- he watches as many sunsets as he wants,
just by pushing his chair along...

BT

Bill Thayer
   LacusCurtius
http://www.ukans.edu/history/index/europe/ancient_rome/E/Roman