That sounds like what I did. I live in Chattanooga. That is 85 degrees longitude. So, 10 degrees off the median. So, I shifted the dial by 10 degrees and it worked!
I figured it out by looking at Shadows. (thanks again, BTW for that program!!) with construction lines in I looked at the dial made normally, then, I looked at it with the longitude correction. It took about two seconds to see what the program had done. Then it was just finding out by how much I needed to change it. So, now I have another question. Where, within a time zone in the US, is the Solar time correct? Is it at the front of the time zone or the center? If the entire zone is 15 degrees, I would never want to offset 10 degrees if the prime is in the middle. But, if it is in the front, that works. Karon Adams Accredited Jewelry Professional (GIA) You can send a free Rosary to a soldier! www.facebook.com/MilitaryRosary www.YellowRibbonRosaries.com From: Donald Christensen [mailto:[email protected]] Sent: Tuesday, July 26, 2011 10:04 PM To: [email protected] Subject: Re: Longitudinal shift? Karon You may be right. I'm not sure what you're asking I'll tell you what I do. I'm in Brisbane australia. Our prime meridian is 150 The town I live in is 147. Therefore my longitude correction is 3 degrees Donald On Tue, Jul 26, 2011 at 11:43 PM, karon <[email protected]> wrote: Do I have this correct? In order to correct for longitude, you determine the degrees from the prime meridian of your time zone. Then, offset the 15 degree hour angle from the center of the top circle. Your first angle is offset from that to mark noon at equinox, then, the rest of your angles are marked at 15 degrees from that mark in both directions, creating non marks on the equinox all the way across. >From there, you simply move back to marking your lines from the noon equinox mark to the CBA point and these are your hour lines. Do I have this correct? Karon Adams Accredited Jewelry Professional (GIA) You can send a free Rosary to a soldier! www.facebook.com/MilitaryRosary www.YellowRibbonRosaries.com <http://www.yellowribbonrosaries.com/> --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial -- 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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