Dear Frank,
I must read your reference...
I have a little book (A Manual of
Modern Navigation by S. M. Burton,
1941) with a chapter on the particular
case of very high altitudes.
The more I think about this, the more snags
I see. If I am very close to the sub-solar
point, and I try
Dear Frank and all,
For measuring the sun's altitude at sea that well-tried instrument, a
sextant, works extremely well. When the sun is almost overhead one is
surely in the calm of the tropics and away from a heaving deck. But you
can use a sextant effectively even in a small yacht in bad
Greetings, fellow dialists,
For astronavigators (are there any surviving?), when the sun is
virtually overhead it is possible to find your position without doing
any calculations. You measure the sun's altitude assuming it is within a
few minutes of arc from overhead, plot the sun's
] On
Behalf Of clar...@aol.com
Sent: Wednesday, July 27, 2011 9:15 PM
To: sundial@uni-koeln.de
Subject: RE: special events
Hi everyone,
Just for your information, there is a mystery novel written by Ramona
Maher, SECRET OF THE SUNDIAL, 1966 which takes place in El Paso, Texas. She
describes
-koeln.de] On
Behalf Of clar...@aol.com
Sent: Wednesday, July 27, 2011 9:15 PM
To: sundial@uni-koeln.de
Subject: RE: special events
Hi everyone,
Just for your information, there is a mystery novel written by Ramona
Maher, SECRET OF THE SUNDIAL, 1966 which takes place in El Paso
, 28 July 2011, 10:51
Subject: Re: special events
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Dear Frank,
I enjoyed your message about determining your
position when the sun is close to overhead.
Your theory is sound and I certainly cannot
compete with your practical experience but
something bothers me...
You measure the sun's altitude assuming
it is within a few minutes of arc from
Dear John,
Yes, Eratosthenes was a great man who is
also noted for his sieve for extracting
prime numbers.
This may not be the right list for asking
about the performance of camels but I am
intrigued that it took a camel 50 days to
travel from Aswan to Alexandria.
The straight line distance is
Dear all,
What I've heard about Eratostenes is that he paid someone to walk the
distance to Syene. He could make up easily the speed of a man walking
(about 6 Kms an hour) for a settled amount of days. He took mesures in
stadiums and there were different lengths of stadiums. If counted in
Fellow SML readers,
I recall reading somewhere that special
measuring individuals - probably slaves - had their stride length set by
a length of chain which would work very well if the surface was
reasonably flat...or did I dream it?
Tony Moss
On 28/07/2011
, 28 July 2011, 18:04
Subject: Re: special events
Fellow SML readers,
I recall reading somewhere that special
measuring individuals - probably slaves - had their stride length set by
a length of chain which would work very well if the surface was
reasonably flat
To: ka...@karonadams.com
Cc: clar...@aol.com; sundial@uni-koeln.de
Subject: Re: special events
No, it is 31°44' N
See Wikipedia
Willy Leenders
Hasselt in Flanders (Belgium)
Visit my website about the sundials in the province of Limburg (Flanders)
with a section 'worth knowing about
Dear John,
You are not wandering too far off topic...
I used to train architectural students to
pace a metre accurately.
When I take a party on a local Sundial Walk
I always start off by congratulating them
on each bringing along their own sundials.
I ignore their blank looks and explain
Dear Brent,
You note:
The people who live in the tropics have
another special event, when the sun is
directly over their latitude.
This is not quite true unless you go to
an enormous amount of trouble. If you
live in the tropics, what normally happens
is that the sun crosses to the south of
Great story Frank!!
I'm fond of celebrations and I've introduced in the Museum where I
work all the equinox and solstices as special days to get together
and have a symposium ( a good Greek invention )
Lets see if someone living in the tropics comes out with a Noon on Top feast
Keep telling
.
www.silversundials.co.uk
www.sundialglass.wordpress.com
-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On
Behalf Of Frank King
Sent: 27 July 2011 10:54
To: bren...@verizon.net
Cc: Sundial List
Subject: Re: special events
Dear Brent,
You note:
The people who live
Hi everyone,
Just for your information, there is a mystery novel written by Ramona
Maher, SECRET OF THE SUNDIAL, 1966 which takes place in El Paso, Texas. She
describes an event in her story called: “Festival of the Shadowless moment”
which takes place across the border in Juares,
Hello again;
The equinoxes and solstices are special solar events for all
of us.
The people who live in the tropics have another special
event, when the sun is directly over their latitude.
Does this special day have a name?
Does anyone take notice of it or mark it on dials or have a
not sure if it has a name, but they sure don't get much of a shadow at
noon on that day :)
On 2011-07-26 23:26, Brent wrote:
Hello again;
The equinoxes and solstices are special solar events for all of us.
The people who live in the tropics have another special event, when
the sun is
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