Re: Hemicyclium correction - a figure might be needed

I can't find an image on the internet, of a Circumference-Aperture Cylinder-Equatorial dial, but I'm going to post a drawing of one. By the way, I use a broad definition of Equatorial Dial. Instead of only dials with a dial-face parallel to the equator, I include all dials that directly measure

Re: Hemicyclium correction

Correction: I'd said: (Tan dec)(R*2Sin(h) ). ...where h is the number hours from 12 noon.where R is the cylinder's radius. Here's the correction: Instead of "hours from 12 noon", It should say: "...where h is 15 degrees times the number of hours from 6 a.m., during the a.m. hours, or the

Re: Hemicyclium correction - a figure might be needed

gt; *From: *Michael Ossipoff <email9648...@gmail.com> > *Sent: *Tuesday, October 24, 2017 1:32 AM > *To: *Brad Thayer <wissenschaft...@verizon.net> > *Cc: *sundial list <sundial@uni-koeln.de> > *Subject: *Re: Hemicyclium correction > > > > > > In the Hemicycli

Re: Hemicyclium correction - a figure might be needed

> *Sent: *Tuesday, October 24, 2017 1:32 AM > *To: *Brad Thayer <wissenschaft...@verizon.net> > *Cc: *sundial list <sundial@uni-koeln.de> > *Subject: *Re: Hemicyclium correction > > > > > > In the Hemicyclium discussion, the OP mentioned having 6-inch copper >

Re: Hemicyclium correction - a figure might be needed

regards, > > Wojtek > > > > *From: *Michael Ossipoff <email9648...@gmail.com> > *Sent: *Tuesday, October 24, 2017 1:32 AM > *To: *Brad Thayer <wissenschaft...@verizon.net> > *Cc: *sundial list <sundial@uni-koeln.de> > *Subject: *Re: Hemicyclium correction

RE: Hemicyclium correction - a figure might be needed

, 2017 1:32 AM To: Brad Thayer Cc: sundial list Subject: Re: Hemicyclium correction In the Hemicyclium discussion, the OP mentioned having 6-inch copper tubing. So, though it was a bit off-topic, I suggested that the tubing could be used for an additional, quicker, project, to make a south

Re: Hemicyclium correction

In the Hemicyclium discussion, the OP mentioned having 6-inch copper tubing. So, though it was a bit off-topic, I suggested that the tubing could be used for an additional, quicker, project, to make a south windowsill sundial--a Circumference-Aprerture Cylindrical Equatorial Dial. But, when I

Re: Hemicyclium correction

gt; > *From:* Brad Thayer <wissenschaft...@verizon.net> > *Sent:* Monday, October 16, 2017 1:48 PM > *To:* sundial@uni-koeln.de > *Subject:* Hemicyclium correction > > > I am looking to make a hemicyclium-type sundial (half-hemisphere) in a > metal working class.

Re: Hemicyclium correction

@compuserve.com> > *Sent:* Sunday, October 22, 2017 12:40 PM > *To:* Brad Thayer <wissenschaft...@verizon.net> ; sundial@uni-koeln.de > *Subject:* Re: Hemicyclium correction > > Hi Brad > > Further to your interest in an hemicyclium you might like to know of this > link to

Re: Hemicyclium correction

today. My sincere apologies to Frans! Patrick From: Patrick Powers Sent: Sunday, October 22, 2017 12:40 PM To: Brad Thayer ; sundial@uni-koeln.de Subject: Re: Hemicyclium correction Hi Brad Further to your interest in an hemicyclium you might like to know of this link to the former webpages

Re: Hemicyclium correction

it useful – or at least interesting! http://www.fransmaes.nl/zonnewijzers/downloads/hemisph.htm Good luck Patrick From: Brad Thayer Sent: Monday, October 16, 2017 1:48 PM To: sundial@uni-koeln.de Subject: Hemicyclium correction I am looking to make a hemicyclium-type sundial (half

Re: Hemicyclium correction

gt; would seem it would be mathematically similar to a section of an armillary >> sphere. >> >> >> >> With a proper adjustable mount, I can adjust for the longitude correction >> (I am currently about 4 degrees away from my nearest meridian) and DST >>

Re: Hemicyclium correction

ection > (I am currently about 4 degrees away from my nearest meridian) and DST > twice a year as well. > > > > *From:* Michael Ossipoff [mailto:email9648...@gmail.com] > *Sent:* Tuesday, October 17, 2017 8:44 PM > *To:* Brad Thayer <wissenschaft...@verizon.net&g

Re: Hemicyclium correction

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

Re: Hemicyclium correction

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

Re: Hemicyclium correction

r bowl will have a cool ancient look when it weathers. Michael Ossipoff > > *From:* Michael Ossipoff [mailto:email9648...@gmail.com] > *Sent:* Tuesday, October 17, 2017 8:44 PM > *To:* Brad Thayer <wissenschaft...@verizon.net> > *Cc:* sundial list <sundial@uni-koeln.de>

RE: Hemicyclium correction

Ossipoff [mailto:email9648...@gmail.com] Sent: Tuesday, October 17, 2017 8:44 PM To: Brad Thayer <wissenschaft...@verizon.net> Cc: sundial list <sundial@uni-koeln.de> Subject: Re: Hemicyclium correction On Mon, Oct 16, 2017 at 8:48 AM, Brad Thayer <wissenschaft

RE: Hemicyclium correction

Subject: Re: Hemicyclium correction Dear Brad, You say: > I am looking to make a > hemicyclium-type sundial > (half-hemisphere) in a > metal working class. > Am I missing anything? Er, yes. Rather a lot alas... Before you start bashing metal it may be worth spending rather

Re: Hemicyclium correction

When I have a clock and not a sundial, clock time has to be converted into sundial time (Local True Solar Time) to make it day-relevant. So, if you make a sundial, shouldn't it just show sundial time? Isn't that really what a sundial for--showing Local True Solar Time? You could make a

Re: Hemicyclium correction

But, if you're willing to give up the Horizontal-Dial's advantages, then an Equatorial-Dial has the following advantages: 1. Its equally-spaced hour-lines allow perfectly accurate linear interpolation of the time, when the shadow is between hour-lines. (But, when usiing pocket horizontal

Re: Hemicyclium correction

On Mon, Oct 16, 2017 at 8:48 AM, Brad Thayer wrote: > I am looking to make a hemicyclium-type sundial (half-hemisphere) in a > metal working class. What little I can find on them says they are > inaccurate, without being very clear on the problem. > But the way,

Re: Hemicyclium correction

Dear Brad, You say: > I am looking to make a > hemicyclium-type sundial > (half-hemisphere) in a > metal working class. > Am I missing anything? Er, yes. Rather a lot alas... Before you start bashing metal it may be worth spending rather less effort on a prototype. > ...they are