Questions for NASS Registrar How do I register this sundial? Now under construction at Soap Lake WA Is there a sundial expert we can consult? Artists rendering from website http://www.soaplakememorialstones.com Is this a Sundial?
Response from NASS Expert A sundial is an instrument designed to tell time The gnomon must be straight and at the correct angle The hour lines depend on the location and are different for each hour. What is now cast in bronze & cement? Artists rendering from website http://www.soaplakememorialstones.com Data & pictures required On angles, size, location,etc
Healing Waters Spa treatment like the thermal mineral baths in Europe Bathing in the alkali waters, soaking in the mud, cures people afflicted with Buerger's disease and other ailments [ www.geocaching.com GC1DJWD
Modern Spa Treatment Spa treatment is now an sensual indulgent luxury You deserve it Hot rocks Hot oil massage Aromatherapy Soap Lake missed the market Calling the healing Waters a new focus
Concept Centre of Interest for Soap Lake Build it and they will come Theme: Calling the healing waters Reflects ethnic and historical themes Mighty winger warrior protecting and comforting maiden with catch basin for healing waters
Installation of basalt columns Angles and offsets are obvious
Error Analysis Sculpture is a poor sundial A worst case scenario Feathered arm at ~37º but curved and offset from center Base at ~30º is offset vertically Various parts of the structure cast shadows on the hour lines on the base
Error Minimazation Considerations Users: –People going to the park to enjoy the beach and water. –Good time not regimented time Season: –Summer not winter –Spring and fall if the weather is good Time –9 AM to 5 PM Summer –Peak mid-afternoon Impression: –Form follows fashion, not function –Looking good is most important
Sundial Considerations Can the sundial work? –giving an impression of time –When most people will see it Design for summer, solar noon +/- four hours Design based on a point gnomon, the tip of the feather Calculate design for 47º –Hold the gnomon tip fixed –Move the base intersection to 37º design Calculate shadow planes for 37º at various times of day and declinations of the year Choose the best compromise considering use Design is fit for purpose
Shadow Plane Analysis The 37º gnomon has a shadow plane Shadow plane intersects the base at a specific angle Shadow angle (SA) varies through the seasons Tan SA= Sin G x Sin Az/ Cos G x Tan Alt +Cos G x Cos Az –giving an impression of time –When most people will see it Spreadsheet used to calculate altitude, azimith and the declination, latitude and time angle Sin Alt = Sin Dec x Sin Lat + Cos Dec x Cos Lat x Cos t Shadow angle calculated from altitude, azimuth and gnomon angle Plotted on sundial design by Zon 2000 with DeltaCad "Error Analysis of The Horizontal Sundial-I" Lauoesch & Edinger, NASS Compendium 2-3, Sept 95
Toolbox NASS Compendium & Presentations Error Analysis of The Horizontal Sundial" Lauoesch & Edinger Error Analysis of Garden Variety Sundials Software: Zon 2000, DeltaCad, Excel Spreadsheets: Error Analysis Garden Variety Sundials Shadow Angles Meridians and Prime Vertical
Acknowledgements Raymond Gravelle: Challenge, data, photographs, patience Larry McDavid: Asking the right questions Phil Palios Philthy Photography Photos of the dedication ceremony at http://www.flickr.com/photos/philthy_photography/sets/72157620424323215/
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