The British Sundial Society
Promoting the Art and Science of Gnomonics since 1989
Castle Howard and Greenwich Observatory
Fully illustrated explanations
Projects to make your own dials
The BSS annual conference will, as previously announced, be held at Nottingham University on the weekend after Easter: April 10-12. The venue is actually a plush conference centre on the campus, so everything is within two adjacent buildings and, unlike last year, there is plenty of parking space!
Nottingham is the home of the Society’s library, a meridian line and several unusual sundials which we aim to show you. The conference runs from Friday afternoon to Sunday after lunch. The residential conference fee includes all meals and refreshments, including the traditional Gala Dinner on Saturday, so is excellent value.
The accounts for the Society up until August 2014 are now available in the Accounts section of the Members Area. Members will need to log in to see this information: please contact the Webmaster in case of difficulty.
On the 20th. January over 120 pupils at Cheney School in Oxford learnt about the principles of solar time-keeping and ancient Greek and Roman dials, saw a demonstration of how they work and built their own hemicyclium dial – all within the space of an hour. The event, organised by the IRIS project as part of an ancient astronomy day, saw Chris Williams deliver a wide-ranging lecture on how the ancients told the time and the differences in their requirements for timekeeping and those we have today. An extract of the presentation, including various pictures of classical dials, can be seen here.
David Brown then took over, first demonstrating how shadows vary depending on the time of year and why a hemicyclium is more practical than a hemispherical bowl,
before each pupil was presented with a kit to make their own.
The Ebenezer Chapel at Hebden Bridge was built in 1777. The Particular Baptists outgrew it by 1857 and it became a Sunday School till 1883. It was sold after the first World War and had various other uses until 1973 when, after being the offices of the Hebden Bridge Times, it became the village Arts Centre, and remains as such today.
The design latitude and declination are both inscribed on this fine dial, together with a motto which reads ‘Quod Petis Umbra Est’ (What thou seekest is a shadow). The sturdy gnomon has a decoratively sculpted lower edge, and although it is quite thin, there is an appropriate substyle gap in the chapter ring. Unusually for a vertical dial, it is flanked on each side by EoT corrections for 38 dates in the year.
As part of its educational activities the BSS is participating in an Ancient Astronomy day being run by the Iris Project in Oxford on 20th January.
Chris Williams will be presenting the theory and usage of Greek and Roman dials and David Brown will be leading practical exercises which will result in over 100 pupils from year 7 upwards making their own dials. More information in this Oxford Mail article, although the picture of an armillary sphere and reference to an orrery are both misleading – pupils will be making a hemicyclium dial (the small, cardboard version!):
We plan to record the day so photos, videos and even the model plans to follow.
UPDATE: Local interest is growing: the Oxford Times has devoted half its front page to the event but regrettably their write-up is also confused about dials and orreries.
A very happy new year to all our visitors.
Thanks to Fiona Vincent we are pleased to provide a table of Equation of Time adjustments and solar declination for 2015. It is provided in two formats, each of which can be printed on a single side of A4 and folded to make a two-sided A5 version. Depending on your preference, this one can be flipped along the long edge and this one along the short edge.
To print, download the relevant PDF (right click on the link and select “Save Link As…”). Open the file in Adobe Reader and select the following options in the print dialogue: “Actual Size” in the Size tab and 2 pages per sheet, Vertical page order and Landscape orientation in the Multiple tab .
Or you may prefer to wait for the printed version which will be included in the March Bulletin!