No, see previous reply. A horizontal dial hour line angles are:- arctan( tan(longDiff + hourFromNoon*15) * sin (lat) ) the relationship of longitude difference to hour line angle involves the sine of the latitude, and only as the sine of the latitude approaches 1, as when approaching the poles, will your approach work. That is "the old wive's trick".
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: part 2 of longitude correction To: "[email protected]" <[email protected]> Date: Wednesday, February 9, 2011, 3:52 PM 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? #yiv1974986180 #yiv1974986180avg_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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