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   Undertoad  Monday Aug 12 01:43 PM

8/12/2002: Digital sundial



You're kidding me, right? No, this is an actual digital sundial, as seen and sold at Digital Sundials International.

For 89 dollars or 91 euros you can have a clock that can only be used at your specified geographic location, that updates itself every ten minutes (which they call "remarkably accurate"), and can only be used when it's sunny.

And they don't mention whether it knows about daylight savings time.



DoublePlusStoned  Tuesday Aug 13 12:16 AM

Defeats the purpose?

Isint the point of a sundial to run without batteries?
Making it digital defeats this purpose.
It is a cool novelty idea tho



bobspoon  Tuesday Aug 13 05:49 AM

Re: Defeats the purpose?

Quote:
Originally posted by DoublePlusStoned
Isint the point of a sundial to run without batteries?
Making it digital defeats this purpose.
It doesn't use batteries - check out the website. It filters the sunlight through a mask which allows through light for that particular time of day, as far as I can tell, which would be a pretty cool engineering trick. Only works in one geographic place though and would have to be aligned properly.

A neat solution to a problem I never knew I had.


jaguar  Tuesday Aug 13 06:14 AM

Quote:
Only works in one geographic place though
Minor issue.


bobspoon  Tuesday Aug 13 06:40 AM

Dammit, I want a sundial on my watch, like Fred Flintstone does. I hope they get a portable version working soon.



NateXLH1000  Wednesday Aug 14 12:29 PM

COOL!

That is the coolest application for polarized filters that I have ever seen!



kodijack  Thursday Aug 15 02:23 AM

I would never buy this, but I would accept it as a gift.



MaggieL  Thursday Aug 15 10:51 AM

Re: 8/12/2002: Digital sundial

Quote:
Originally posted by Undertoad
And they don't mention whether it knows about daylight savings time. [/b]
I suspect it knows only about true solar time. Back in the 1960's Scientific Amarican's Amateur Scientist column published a description of a highly accurate sundial that could be adjusted to keep mean solar time, as a clock would.

But from the photo, it looks like you have to judge the relative brightness of the figures for the ten-minute intervals to read the time, probably with about two minute accuracy.


russotto  Thursday Aug 15 01:05 PM

Re: Re: 8/12/2002: Digital sundial

Two minute precision. If it doesn't correct for true solar v. mean solar, the accuracy is much less than that.

When they get it down to the point where it shows minutes, I might consider one. If I have a window which faces the right direction. My house is lacking in useless decorative items (not to mention furniture), why not a geeky one?



MaggieL  Friday Aug 16 04:32 PM

Re: Re: Re: 8/12/2002: Digital sundial

Quote:
Originally posted by russotto
Two minute precision. If it doesn't correct for true solar v. mean solar, the accuracy is much less than that.
Point well taken.

Another digital sundial...

http://www.deutsches-museum.de/ausst...s/e_sonne1.htm

I don't think these use either polarized light or holography, I might be mistaken.


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