ay, 30 March 2015 5:24 p.m.
To: peter.ma...@adelaide.edu.au; sundial@uni-koeln.de
Subject: Re: Clouding the issue
Hello Peter and all,
Yes, clouds are a significant, perhaps the overwhelming issue with sundials.
Night knocks out half the time and clouds at least half of the remaining
daylight
That is an excellent question! I have seen this photo before, and never
noticed the numbers running twice in a semicircle. I, too, am perplexed.
I read about this dial in Hester Higton's book "Sundials at Greenwich."
The dial operates on two successive polarizations of light - the first
being wh
> Chester, UK
>
>
> --- Original Message ---
>
> From: "Fred Sawyer"
> Sent: 30 March 2015 13:38
> To: "Roger Bailey"
> Cc: "Sundial Mailing List"
> Subject: Re: Clouding the issue
>
> See "Wheatstone's Polarizing Sundial&quo
--- Original Message ---
From: "Fred Sawyer"
Sent: 30 March 2015 13:38
To: "Roger Bailey"
Cc: "Sundial Mailing List"
Subject: Re: Clouding the issue
See "Wheatstone's Polarizing Sundial" by Jim Mahaffey in The Compendium
8(2):1-3, Jun 2001. This is
s?
> I don't think so. The opportunity remains, a chimera, like analemmatic
> moondials. I am working on the latter for the NASS conference in Victoria
> BC in June.
>
> Regards, Roger Bailey
>
> *From:* Peter Mayer
> *Sent:* Sunday, March 29, 2015 3:13 PM
> *To:* sundia
atic moondials. I am
working on the latter for the NASS conference in Victoria BC in June.
Regards, Roger Bailey
From: Peter Mayer
Sent: Sunday, March 29, 2015 3:13 PM
To: sundial@uni-koeln.de
Subject: Clouding the issue
Hi,
In the "Last Word" section of a recent _New Scienti
Hi,
In the "Last Word" section of a recent _New Scientist_ Stephen
Parish raised the question of sundials that might work on cloudy
days...Clearly, polarisation is possible, but I'm doubtful about shadow
casting...
Clouding the issue
* 18 March 2015
* Magazine i
