My father lives in Japan, but thanks God, he didnt suffer with the tsunami,
although we are yet apprehensive, as well as all the Japanese descendents
here in Brazil.
Thanks for your words, Conxita.
2011/3/15
> I'll second that! Well put, Conxita.
> David Brown
> Somerton, Somerset, UK
>
> Conxi
Hello;
I have an idea to build a mechanical sundial.
It would have a moving gnomon that would track the sun.
If the gnomon was a hollow pipe, a spot of light would
shine out of the bottom that could be used to indicate a
time and date.
With all of the photo voltaic systems available now the
ha
The equitorial drive of a telescope mount
also turns at the rate of the earths rotation
but in the opposite direction, so as to keep a
specific point in the sky in the telescopes
field of view. But you have different rates for
different kinds of objects and you have to
account for refraction.
>
