(I hit the wrong button in my last email and it went out without my letter- sorry!)
Hi Donald: I understand your question, because I had this same question years ago when I was a beginner. The answer is no. To re-phrase your question so that everybody understands it, you are asking this- When drawing a sundial face, should you simply rotate the normal solar time hour lines about their center of origin by 3 degrees to obtain a longitude corrected face? No, you can not do this. Each hour line has to be calculated and drawn individually. This is a common error some beginning dialists make when designing longitude corrected dials. I almost made this mistake too once! To help you out (since a picture is worth a thousand words) I drew your sundial in five minutes using Shadows Pro and sent it you off list the drawing. I just didn't want you to make a common mistake. But verify it for yourself and don't take my word for it. That's how you learn! Keep asking good questions! Thanks John From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Donald Christensen Sent: Wednesday, February 09, 2011 3:52 PM To: sundial@uni-koeln.de Subject: part 2 of longitude correction I'm laying out lines for a new dial I may not have been clear. I don't intend to rotate the gnomen. The dial will still point true north By labeling 12:12 as noon and 13:12 as 13:00, I am rotating the hour marks. My question is, Is it by an even 3 deg? -- Cheers Donald 0423 102 090 This e-mail is privileged and confidential. If you are not the intended recipient please delete the message and notify the sender. Un-authorized use of this email is subject to penalty of law. So there!
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