Sundial
Jan 2, 2021 13:18:02 #
Jan 2, 2021 13:42:40 #
fjdarling
Loc: Mesa, Arizona, USA
Cool. Why is there an hour difference between the time on the sundial and the time stamped in the metadata of the photo?
Jan 2, 2021 15:00:04 #
Jan 2, 2021 15:44:15 #
fjdarling wrote:
Cool. Why is there an hour difference between the time on the sundial and the time stamped in the metadata of the photo?
Someone didn’t re-set the sundial?
Jan 2, 2021 16:24:04 #
It looks to me that the EXIF says the hour is 10:42, about what the sundial says. BUT the year is 2014???
Jan 2, 2021 16:42:41 #
Jan 2, 2021 16:44:25 #
fjdarling
Loc: Mesa, Arizona, USA
I was looking at the wrong time stamp - the file date/time. Thanks for waking me up. :-)
Jan 3, 2021 05:12:40 #
Harry0
Loc: Gardena, Cal
fjdarling wrote:
Cool. Why is there an hour difference between the time on the sundial and the time stamped in the metadata of the photo?
Daylight savings time.
Did YOU want to rotate that thing twice a year?
Jan 3, 2021 08:25:22 #
Jan 3, 2021 12:34:44 #
Difference between apparent time (based on the Sun angle) and legal time... (the Sun dial is insensitive to the year :) )
Jan 3, 2021 13:30:14 #
dlmorris
Loc: Loma Linda, Ca
Most such sun dials can be as much as +- 16 minutes or so, from clock time, depending also on the time of year, or more so if they are between time zones. Then, as someone pointed out, they don't compensate for the difference between standard time and daylight savings time.
I have built one (out of wood) that takes all those factors into consideration, and reads clock time within an accuracy of a minute or two. My time markings are at 10 minute intervals, so you need to interpolate when the pointer is between those two points. Not difficult, like a wall clock without minute markings.
It is a relatively simple design, and easy enough to build, and I have searched the internet and can find only one or two examples, in photographs, with no indication of how they work. Once I can figure out how to make a video and edit it, I will put the whole thing on youtube.
I have built one (out of wood) that takes all those factors into consideration, and reads clock time within an accuracy of a minute or two. My time markings are at 10 minute intervals, so you need to interpolate when the pointer is between those two points. Not difficult, like a wall clock without minute markings.
It is a relatively simple design, and easy enough to build, and I have searched the internet and can find only one or two examples, in photographs, with no indication of how they work. Once I can figure out how to make a video and edit it, I will put the whole thing on youtube.
Jan 3, 2021 14:40:54 #
Jan 3, 2021 14:44:57 #
Second pass. I love it! Every time I find a weathered brass/bronze (???) garden ornament like this, I get a fantastic shot 
Jan 3, 2021 15:45:40 #
fjdarling wrote:
Cool. Why is there an hour difference between the time on the sundial and the time stamped in the metadata of the photo?
The sundial is still on DST?
Jan 3, 2021 20:15:27 #
gemlenz wrote:
Found this at a park nearby.
Because the dial wasn’t reset for Daylight Standard Time.
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