Armillary Dial

installed a 'modern' dial? Is there a history of the development of thedial ? Best wishes Heiner Thiessen 51N 1W

Re: educational dials for schools

Thanks all for your good advice on the educational dials for schools. Much food for thought there. Heiner Thiessen -

educational dials for schools

Is anyone out there aware of makers of educational sundials (perhaps with an international distribution) whose products are well affordable for tight school budgets? Heiner Thiessen 51N1W -

solar clock

on such a project. Heiner Thiessen 51N / 1W -

Re: solar clock

The turning globe (or simply the northern hemisphere) should be inside the house and should be the key part of a solar clock, showing the eastward turning planet , thus enabling the observer to read L.A.T. around the planet against a clock face. But the movement of the globe should be checked

Re: International Gnomonic Bulletin (IGB) n� 05 Febr uary 2004

Nicola, Anche io, non posso aprire le pagine. Un email per favore. Heiner Thiessen - Original Message - From: [EMAIL PROTECTED] To: sundial@rrz.uni-koeln.de Sent: Friday, February 06, 2004 1:25 AM Subject: Re: International Gnomonic Bulletin (IGB) n° 05

dialling in Andalusia

Dear all, I am going to Granada, Cordoba and Seville in Andalusia, Spain very shortly and wondered whether somebody might be able to point out a few dials or astrolabes in the area. Thanks: Heiner 51N/1W -

Re: Great clock value

in the right direction? Thanks: Heiner Thiessen 51 00 43 N 00 56 38 W -

duomo di Milano

in the UK? Heiner Thiessen 51N 01W -

Re: Sundials at Pole

increments, which are due to the changes in the Sun's declination? But the 'fine threads' of that spiral seem to suggest that, strictly speaking, the altitude of the Sun during that one day does change, if only marginally. Or am I making a mistake here? Heiner Thiessen 51 00 43 N 00 56 38 W - -

Eratosthenes

degrees. All are now considered to have overestimated the angle for that period, if only marginally. But how did they do it? What method was actually involved in calculating the angle of the inclination of the Earth's axis, relative to the plane of its orbit? Can anybody help? Yours curiously Heiner