[time-nuts] Fwd: [New post] Sun-Seeking Sundial Self-Calibrates in No Time

[djl]

for fun 

-------- Original Message -------- 

 		SUBJECT:
 		[New post] Sun-Seeking Sundial Self-Calibrates in No Time

 		DATE:
 		2020-05-06 14:01

 		FROM:
 		Hackaday <donotreply at wordpress.com>

 		TO:
 		djl at 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 

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-- 

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
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