What is rotated by the longitude difference is only an equatorial or an armillary dial. The resulting horizontal or vertical or whatever dial that results from its surrogate equatorial dial will then have correct hour line angles. The "old wive's trick" only works for lattitudes as they approach the pole.
Simon Simon Wheaton-Smith www.illustratingshadows.com Silver City, New Mexico W108.2 N32.75 and Phoenix, Arizona, W112.1 N33.5 --- On Wed, 2/9/11, Donald Christensen <[email protected]> wrote: From: Donald Christensen <[email protected]> Subject: longitude correction To: [email protected] Date: Wednesday, February 9, 2011, 2:49 PM How do I design a longitude correction in my sundial? Correct me if I'm wrong My horizontal dial is for Brisbane. The longitude is 153 deg and the standard meridian is 150. This is a 3 deg difference. I'll then rotate the hour lines by 3 deg to compensate #yiv915318336 #yiv915318336avg_ls_inline_popup{padding:0px 0px;margin-left:0px;margin-top:0px;overflow:hidden;word-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:130%;} -- 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! -----Inline Attachment Follows----- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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