Correction:
I said that the declination lines would be circles around the cylinder's
inside circumference.
Actually, because the distance of the light-spot from the
circumference-aperature varies, around the dial, the declination lines
wouldn't be that simple.
The drawing of the declination
Of course, for the Cylinder Equatorial with circumference aperature, you
could have declination-ilnes, which would be circles around the cylinder's
circumference.
Michael Ossipoff
On Wed, Oct 18, 2017 at 10:23 PM, Brad Thayer
wrote:
> Michael,
>
>
>
> Thank you for
Just one safety quibble:
If you mount the spike sticking up, then it will be an eye-hazard, even
with the ball on its end.
That's a good reason to mount the spike horizontally, at the rim of the
bowl. It could be mounted in a north-south groove at the south side of the
bowl. Mounting the spike
Dear Brad,
I'm delighted that you enjoyued
my "tutorial"...
> However, its your step 19 I am
> interested in.
Ah yes. That's where I mention
marking out equal hours. I thought
you would be most interested in
that step :-)
You add...
> And if I do tilt the hemispherium
> so that the horizon