Sundial
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 SSW facing, vertical declining sundial on Moot Hall, Aldeburgh, Suffolk, England. |
A sundial is a device that determines the time of day by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style onto a surface marked with lines indicating the hours of the day. The style is the time-telling edge of the gnomon, often a thin rod or a sharp, straight edge. As the sun moves across the sky, the shadow-edge aligns with different hour-lines. All sundials must be aligned with the axis of the Earth's rotation to tell the correct time. In most designs, the style must point towards true celestial north (not the north magnetic pole or south magnetic pole). That is, the style's horizontal angle must equal the sundial's geographical latitude.
- Related: Foucault pendulum, Francesco Bianchini, Horology, Moondial, Equation clock, Scottish sundial, Tide (time)
| Understanding sundials through map projections Understanding sundials through map projections wvaughan.org/sundials.html - Web |
| The Ancient Vedic Sun Dial The Ancient Vedic Sun Dial www.vedicastro.com/astronomy5.asp - Web |
| Analemmatic Sundial at Tanglewood Analemmatic Sundial at Tanglewood gonewengland.about.com/.../Tanglewood-Photos_6.htm - Web |
Gallery for «Sundial»
- Digitalsundial.jpg
Average relevance
| Asociación Amigos de los Relojes de Sol Asociación Amigos de los Relojes de Sol relojesdesol.info - Web |
| British Sundial Society British Sundial Society www.sundialsoc.org.uk - Web |
| La Commission des Cadrans Solaires du Québec La Commission des Cadrans Solaires du Québec cadrans_solaires.scg.ulaval.ca - Web |
| Commission des Cadrans Solaires de la Société Astr... Commission des Cadrans Solaires de la Société Astronomique de France www.commission-cadrans-solaires.fr - Web |
| Coordinamento Gnomonico Italiano Coordinamento Gnomonico Italiano www.gnomonicaitaliana.it - Web |
| Derbyshire Sundials Derbyshire Sundials www.pandy.me.uk/sundials/ - Web |
| North American Sundial Society North American Sundial Society www.sundials.org - Web |
| Register of Scottish Sundials Register of Scottish Sundials www.sundialsofscotland.co.uk - Web |
Low relevance
| Societat Catalana de Gnomònica Societat Catalana de Gnomònica www.gnomonica.cat - Web |
| De Zonnewijzerkring De Zonnewijzerkring www.de-zonnewijzerkring.nl/eng/ - Web |
| Zonnewijzerkring Vlaanderen Zonnewijzerkring Vlaanderen www.zonnewijzerkringvlaanderen.be - Web |
