Hi Chris, I liked you sundial. It’s always interesting to see other ideas on how to make sundials. I’ve printed your sundial onto paper and when I get time I will build one. How many have you made and what did you use to make them?
Thanks for your ideas, keep them coming. And welcome to the group, Roderick Wall. From: Chris Dobbie Sent: Thursday, November 11, 2010 7:28 AM To: [email protected] Subject: "Digital" Analemmic sundial? Just in the last week Ive become fascinated with sundials and decided to join this mailing list. This is my first post here and with that said Id like to say hello to all members and ask that you forgive my noobish questions. I saw a digital equatorial sundial for the first time the other day and fell in love with its simple design, just a band of metal bolted to a rock. I soon realized that its simplicity came with a cost to functionality. Ive since come up with a far less simple design that I think solves most functionality problems including equation of time and the inability of use between 6 pm and 6 am. You cant really tell from the model but I envision the equatorial ring being able to rotate 360 degrees with markers along its track for longitude and DST correction as well as current times for other cities around the world. One could also make it universal by marking it in degrees and making the base adjustable. If build large scale, minute lines could be added to the analemma. Ive only recently started researching sundials and the math of the analemma is still confusing me so I have a couple questions. I imagine if I calculated out the amalemma and checked the time at noon this dial would be fairly accurate but how accurate would it be at dawn and dusk? Would the angels of the analemme change? Also, would rotating the equatorial ring affect accuracy? If the dial does work and the amalemma and dial were marked in smaller increments, how accurate do you think it would be? Lastly, Im wondering if you have ever seen this style of dial before in design or finished form? I have yet to come across one and would love to see any pictures or info thats out there. Thank you so very much for any and all you can share with me. Cheers, Chris -------------------------------------------------------------------------------- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial -------------------------------------------------------------------------------- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1153 / Virus Database: 424/3247 - Release Date: 11/09/10
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