NavList:

   

Reply

Dear Fred,
Thank you very much.
I am analysing your data.

On Wed, 29 Sep 2004, Fred Hebard wrote:

> to play a piano, but it takes some proficiency.

Sounds encouraging. I studied piano too in my youth:-)

> as I had trouble with a telescope.

What trouble with a telescome?
I think I am also having troubles with my scopes,
and even considering buying a Cassens-Plath telescope
(which fits SNO-T as well, they say).

> I would buy
> a Tamaya Spica.  I would like to sample some of the Russian sextants
> too, but....

Why Tamaya? You think it is superior to Cassens-Plath is some respects?
I would be also interested to sample a Cassens-Plath;
maybe sometime we will come together...

BTW, does anyone in the list own an SNO-T? Or maybe an inverting scope
of SNO-T? I have some VERY technical matters about this scope to
discuss...

> from electrolytic corrosion, which disfigures many an aluminum sextant.

An interesting (and probably unique?) feature of the SNO-T I mentioned
before  is its NON-ELECTRIC illumination...

> I still have trouble getting stars to overlap
> precisely, although some measurements were much more accurate

Exactly the same problems I have.
Is there an alternative way of sextant calibration?
I mean without using other expensive instruments like a theodolite?

Yout table (which I still have to study carefully)
shows that you had problems somewhat similar to my ones.
Which sextant (and scope!) was used, if you remember?
The columns in the table I received were not aligned well.
After the date, what is this? GMT?
And what is "N(Da-Do)"? (Third column from the right).

> Note the widely
> varying difference between Da-Do for objects between 25 and 33 degrees
> apart.

Yes!! Same effect I had. I even  suspected something was wrong with the
refraction theory... for this case. How did you calculate the
"real" distances?

> Object1 Object2 degrees date    N(Da-Do)     Mean(Da-Do:sec) Std(Da-Do:sec)
>
> Betelgeuse Rigel   18      04/02/2003 00:59:18     3       17      20
> Procyon Betelgeuse 25      01/13/2003 01:25:29     1       5
> Sirius  Procyon    25      02/14/2003 04:57:12     3       -2      5
> Sirius  Procyon    25      02/23/2003 22:24:40     4       30      20
> Sirius  Betelgeu   27      01/12/2003 03:46:39     2       -52     0
> Betelgeuse Pollux  33      02/23/2003 22:33:08     3       -45     11
> Capella Betelgeuse 39      01/20/2003 23:21:31     3       2       10
> Vega    Arcturus   59      07/16/2004 02:40:23     5       -13     59
> Sirius  Capella    65      02/03/2003 02:09:00     13      -63     71
> Sirius  Schedar    104     02/03/2003 04:09:56     4       -47     95
>

   

Reply