RE: Buyer's Guide

[Robert Terwilliger]

Some years ago I put a NASS sundial FAQ online. This included a page called "Check your dial, and align it to True North" which included most of the criteria Mike covered with the exception of "are both sides of the gnomon straight" - (Geez, I hope I never see a spiral one).   The NASS FAQ also included :   ------------------------------------------- 4. If you want to test further . . .   Measure the style height - the vertical angle the gnomon makes with the dial face.   Measure the angle on the dial face between the sub-style and the 3:00 or 9:00 hourline. (These two angles should be the same.)   The sine of the style height should equal the tangent of the 3:00 hourline.   This trick can also be used to determine the style height, and hence the original latitude, for a dial that is missing its gnomon. ------------------------------------------   I would appreciate any suggestions for improving the NASS FAQ.   The "check your dial" page can be seen at:   http://sundials.org/faq/setup/findnorth.htm   The complete FAQ an be found at:   http://sundials.org/faq/   Bob Terwilliger NASS Webmaster From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Shaw Sent: Friday, May 05, 2006 3:20 AM To: Sundial List Subject: Buyer's Guide Fellow enthusiasts,   I get really annoyed about the sundials that I see on sale in garden centres here in the UK. The people who make them seem to have no conception about how they work. As they are invariably horizontal dials, I thought I would put a "Buyer's Guide" to such dials on my web site. I think there are 5 golden rules - have I missed any?   Check it out - follow the link from my home page. Helpful comments welcomed.   Mike Shaw   53.37N 3.02W   www.wiz.to/sundials

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