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-------- Original Message -------- SUBJECT: [New post] Sun-Seeking Sundial Self-Calibrates in No Time DATE: 2020-05-06 14:01 FROM: Hackaday <donotre...@wordpress.com> TO: d...@montana.com Kristina Panos posted: "Sundials, one of humanity's oldest ways of telling time, are typically permanent installations. The very good reason for this is that telling time by the sun with any degree of accuracy requires two-dimensional calibration -- once for cardinal direction, " NEW POST ON HACKADAY SUN-SEEKING SUNDIAL SELF-CALIBRATES IN NO TIME [1] by Kristina Panos [2] Sundials, one of humanity's oldest ways of telling time, are typically permanent installations. The very good reason for this is that telling time by the sun with any degree of accuracy requires two-dimensional calibration -- once for cardinal direction, and the other for local latitude. [poblocki1982] is an amateur astronomer and semi-professional sundial enthusiast who took the time to make a self-calibrating equatorial 'dial that can be used anywhere the sun shines [3]. All this solar beauty needs is a level surface and a few seconds to find its bearings. Switch it on, set it down, and the sundial spins around on a continuous-rotation servo until the HMC5883L compass module finds the north-south orientation. Then the GPS module determines the latitude, and a 180° servo pans the plate until it finds the ideal position. Everything is controlled with an Arduino Nano and runs on a 9V battery, although we'd love to see it run on solar power someday. Or would that be flying too close to the sun? Check out how fast this thing calibrates itself in the short demo after the break. Not quite portable enough for you? Here's a reverse sundial you wear on your wrist [4]. KRISTINA PANOS [2] | May 6, 2020 at 1:00 pm | URL: https://wp.me/paBn4l-1IXQ Comment [5] See all comments [6] Unsubscribe [7] to no longer receive posts from Hackaday. Change your email settings at Manage Subscriptions [8]. TROUBLE CLICKING? Copy and paste this URL into your browser: https://hackaday.com/2020/05/06/sun-seeking-sundial-self-calibrates-in-no-time/ -- Dr. Don Latham AJ7LL PO Box 404, Frenchtown, MT, 59834 VOX: 406-626-4304 Links: ------ [1] https://hackaday.com/2020/05/06/sun-seeking-sundial-self-calibrates-in-no-time/ [2] https://hackaday.com/?author=37213840 [3] http://www.instructables.com/id/Self-Calibrating-Sundial/ [4] https://hackaday.com/2017/07/27/tell-time-with-a-reverse-sundial-watch/ [5] https://hackaday.com/2020/05/06/sun-seeking-sundial-self-calibrates-in-no-time/#respond [6] https://hackaday.com/2020/05/06/sun-seeking-sundial-self-calibrates-in-no-time/#comments [7] https://public-api.wordpress.com/bar/?stat=groovemails-events&bin=wpcom_email_click&redirect_to=https%3A%2F%2Fsubscribe.wordpress.com%2F%3Fkey%3Dd109931f8119f9f47c8f2ccdf1639bbf%26email%3Ddjl%2540montana.com%26b%3DpyeE6emrnTuFfOk35B6kXVdiSTHEjcWXqxhcgfDt1TKC_lWCaLs8cWTfNShbQdkY4OjvqBoYYQevPWRe7dygICvlCcze6pZh1YLH-d3avD2wOig%253D&sr=1&signature=9030c6b42ce26b79007a1ffce6dc6135&user=b74863dc25f865bb6e7b9e41a608caed&_e=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 FtcD0xNTg4Nzk1MjMxLjcwNDMmcXVldWU9c3luYyZob21lPWh0dHBzJTNBJTJGJTJGaGFja2FkYXkuY29tJnNpdGV1cmw9aHR0cHMlM0ElMkYlMkZoYWNrYWRheS5jb20mY2Q9MC4wMDI3JnBkPTAuMDA0MSZxdWV1ZV9zaXplPTImaWRjPTEmdGltZW91dD0xNSZmb3I9amV0cGFjayZ3cGNvbV9ibG9nX2lkPTE1NjY3MDE3NyIsIl9lbiI6IndwY29tX2VtYWlsX2NsaWNrIiwiX3RzIjoxNTg4Nzk1MjYxMzMxLCJicm93c2VyX3R5cGUiOiJwaHAtYWdlbnQiLCJfYXVhIjoid3Bjb20tdHJhY2tzLWNsaWVudC12MC4zIiwiX3VsIjpudWxsLCJibG9nX3R6IjoiLTciLCJ1c2VyX2xhbmciOm51bGx9&_z=z [8] https://public-api.wordpress.com/bar/?stat=groovemails-events&bin=wpcom_email_click&redirect_to=https%3A%2F%2Fsubscribe.wordpress.com%2F%3Fkey%3Dd109931f8119f9f47c8f2ccdf1639bbf%26email%3Ddjl%2540montana.com&sr=1&signature=0e2a8e222dd4332057de030e76d8dcd4&user=b74863dc25f865bb6e7b9e41a608caed&_e=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 kZoYWNrYWRheS5jb20mY2Q9MC4wMDI3JnBkPTAuMDA0MSZxdWV1ZV9zaXplPTImaWRjPTEmdGltZW91dD0xNSZmb3I9amV0cGFjayZ3cGNvbV9ibG9nX2lkPTE1NjY3MDE3NyIsIl9lbiI6IndwY29tX2VtYWlsX2NsaWNrIiwiX3RzIjoxNTg4Nzk1MjYxMzMxLCJicm93c2VyX3R5cGUiOiJwaHAtYWdlbnQiLCJfYXVhIjoid3Bjb20tdHJhY2tzLWNsaWVudC12MC4zIiwiX3VsIjpudWxsLCJibG9nX3R6IjoiLTciLCJ1c2VyX2xhbmciOm51bGx9&_z=z _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.