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--- Begin Message ---Hello, all When making sundials with pupils of different ages, I was practicing two approaches: 1. Joyful: direct marking of hour lines from the shadow at certain moments (for 7-10 years old). 2. Scientific: production according to the drawings (geometric construction and program calculations for older children). When going the first way, a stand-alone EXEL-program from Ricardo Cernic ( http://www.mysundial.ca/tsp/sun.html ) was very useful. I've failed to find something as convinient for smartphones and tablets, and posted a new Sun calculator on https://freeright.net . It meets my goals, and may be interesting for someone else. A few remarks. 1 Accuracy and precision of calculations VBasic procedures with Meus's algorigths from EXEL-prototype were just re-written in PHP-language. So, in general it should be perfect, as Ricardo Cernic and Carl Sabanski did a great job while testing original source. Many thanks to Ricardo, who sent me protective password, and allowed to "pick" his code. All output parameters are rounded to readable and measurable values. -0.83 degree refraction factor for sunrise/sunset is assumed. All angles are in decimal form. Ephemerides are recalculated in realtime mode every 60 seconds (accompanied by a slide show on desktop). 2. Features - as Geolocation API is used, seting your current coordinates and time zone becomes easier; - annual and daily reports are available in CSV-format. It is possible to import it in any spreadsheets program, steps are 5-10-15-30-60 minutes, or 1-10-15-30 days; - a layout of simple horizontal sundials can be generated for a given latitude (with exception to near equator ;-); - although it has nothing with the sundials, you can calculate the dates of Easter/Pesah holidays. Calculated Georgian-Julian days-shift by Carl Gauss is used. 3. Security Due to Google-driven recommendations, some browsers do not allow you to use Geolocation API with unprotected http-sites. Just use secure https-connection instead. The application is server-based, Java and cookies free, no registration, no tracing, no adds. 4. Errors Inevitable, but will be corrected as they appear. Please, write directly, if any occur. Congratulations with tomorrow equinox! Alexey Krutiakov N56.1 E37.9
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