EoT diagram

Hi, I figured out a way to plot EoT curve which I didn't see in sundial books I own. Diagram is enclosed here. For a better resolution one, see http://dl.dropbox.com/u/31382133/EoT%20.png Best regards, ChiLian 24.8N 121E attachment: EoT_S

Re: EoT diagram

I’m pretty sure there was one of these in an early version of Jane Walker’s “Make a Sundial” British Sundial Society publication. There is also one on the rear of Jim Morrison’s astrolabe. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials---

Re: EoT diagram

On 21/06/2011 18:09, Mike Shaw wrote: I'm pretty sure there was one of these in an early version of Jane Walker's Make a Sundial British Sundial Society publication. There is also one on the rear of Jim Morrison's astrolabe. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials

RE: EoT diagram

The equation graph projected on a circle is used as a kidney piece cam in a watch movement that can indicate the equation. Here is a picture of the gear carrying the kidney piece. It turns once a year. http://people.timezone.com/mdisher/decorte/gyro2/gyro2_3.jpg Bob _

Re: EoT diagram

Hi ChiLian and Robert, Thanks ChiLan, your EOT curve is interesting. I suppose anything to do with sundials has a high chance of being invented before as sundials have been around for a long time. Robert, the kidney shape cam in the watch is interesting, is this watch still in production and

Re: EoT diagram

Hi all, After sending my last email. I thought I should have 1st searched the Internet before sending it: http://forums.timezone.com/index.php?t=treegoto=5710449rid=0 Note: scroll down to the larger photo. Looks as if the outer EOT ring can be adjusted (turned) to have the current EOT month

Re: EoT diagram

Hi again, This is a good link on EOT and watches http://www.timezone.com/extras/200711101492 Roderick Wall. From: R Wall Sent: Wednesday, June 22, 2011 7:08 AM To: Robert Terwilliger ; clc...@mx.nthu.edu.tw ; sundial@uni-koeln.de Subject: Re: EoT diagram Hi all, After sending my last

How to force spreadsheet to create printable graph with same scale in X and Y?

Hi, I sometimes use a spreadsheet to calculate a series of X,Y points, and then use these points to create a scattergram chart. My problem is that whenever I do this, the chart appears on the screen as a rectangle. The X and Y dimensions aren't to the same scale. I have to set the gridline

RE: EoT diagram

Here's another picture I drew of a kidney piece. I believe it was published in the NASS Compendium Vol I, No I http://twigsdigs.com/sundials/design/kidney.htm Bob _ From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Robert Terwilliger Sent:

RE: EoT diagram

Roderick, The eot watch your link produced does not seem to be mechanical - hence no kidney piece. Google movement equation of time watch Then try the images Here's one http://www.breguet.com/var/ezwebin_site/storage/images/equation-of-time/3646 -5-eng-GB/Equation-of-time.jpg

Re: How to force spreadsheet to create printable graph with same scale in X and Y?

Even if you could get equalspacing, aspect ratios would still be a problem. My solution was in both my Excel and Open Office spreadsheets (see my website) to also print a square box with diagnols to show a V or an A. Then changing manually the X span of the chart until the V or A apex measured

Two programs of interest to list members

Good afternoon and a happy winter solstice to all, The following two Windows programs may be of interest to list members: Time Zone Master www.relativedata.com/time-zone-master MyStars! www.relativedata.com/mystars Cheers, John John Pickard john.pick...@bigpond.com

Re: EoT diagram

Nice! I love the 1 RPYear wheel! Sent from my iPhone On Jun 21, 2011, at 4:43 PM, Robert Terwilliger b...@twigsdigs.com wrote: Roderick, The eot watch your link produced does not seem to be mechanical – hence no kidney piece. Google movement equation of time watch Then try the

Re: EoT diagram

I see how the kidney piece works, but what's with the oddly shaped Month wheel? Sent from my iPhone On Jun 21, 2011, at 12:55 PM, Robert Terwilliger b...@twigsdigs.com wrote: The equation graph projected on a circle is used as a kidney piece cam in a watch movement that can indicate the

RE: How to force spreadsheet to create printable graph with samescale in X and Y?

It's not easy, as I have also found. Here's a hint to the procedure. The author's intent is to force a certain aspect ratio on the chart, for the best visibility of trends. Interesting concept, in itself... Another suggestion farther down, below the == bar. Dave