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 o
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 s
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 loweri
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
of
Dave Bell wrote:
> On Sun, 16 May 1999, Chuck O'Connell wrote:
>
> I could not believe
> > my eyes - I could clearly make out 2 large sunspots and
> > 3 smaller ones. I think the sunspots were probably
> > monstrous as far as sunspots go
> >
> > Chuck
>
> Historically, there have been a num
On Sun, 16 May 1999, Chuck O'Connell wrote:
> The most unusual way I've ever seen sunspots is *directly*.
> I was driving west at sunset on an *extremely humid* hot
> august evening. As my car crested a hill the
> sun was sitting on the horizon, *easily* viewable because
> it was so washed out
Message text written by John Carmichael
>By the way, did you know that you
can use a shadow sharpener to see sunspots on the sun?<
Hi John,
It's hard to see if the image is too small though.
The most unusual way I've ever seen sunspots is *directly*.
I was driving west at sunset on an *extremel
A bunch of us, including astronomers from Kitt Peak, traveled to southern
Baja for the July 11, 1991 total eclipse. The mexican government provided
free mylar eclipse filters to the public. The mylar measured about 3" X
1/2" and were "framed" by a 1/2" of thin white cardboard. Mylar viewing
st
