Lots of instructional help is available from Carl Sabanski's Sundial Primer First, you can import sundial designs from programs such as de Vries ZW2000, SONNE, and use Delta CAD to add final touches or you can choose from existing "Basic Programs" that direct Delta CAD to draw sundials on its own. JAVA run time plugin is required for your browser.ĭelta CAD is a favorite computer aided design (dialing) program. A plane or topographic map can be selected. For the currently selected location and the current date and time, information such as the number of daylight hours and sunrise/sunset times are shown in a panel on the right-hand side. Various locations around the world can be selected, and the date and time can be changed. The position of the sun (projected on to the Earth) is shown as a yellow circle. This program by Steven Pugh is an JAVA applet to show which parts of the globe are in daylight and which are in darkness. Riccardo and Andrea Anselmi have created software design tools to create a wide variety of sundials, including horizontal and vertical declining sundials, cylindrical, conical, bifilar, and other types of sundials. Versions are available for Windows, Linux, and Mac. For Windows, Linux, and Mac.ĬalCad is a program for drawing horizontal and vertical sundials (including declination and inclination) by Yvon Massee. Plots may include the Equinox and Solstices and additional Zodiac date lines or particular user dates.Īn added feature is the creation of 3D animations of the dial to visualize the shadow lines. Also allows Italian, Babylonian, Temporal, and Sidereal hours. The software allows use of both local solar time and civil time, correcting with the Equation of Time and longitude. There are other programs as well, including a calendar for any year, and the date of Easter.ĬadSol creates many different types of sundials including horizontal and vertical (with ability to decline or incline the dials), and those with polar gnomon, analemmatic, bifilar, cylindrical (Shepherd's Dial), and dials on multiple planes. Daniel Roth’s simple Azimut und Elevation der Sonne calculator based on equations from Pfeger’s Astronomy with the Personal Computer. Extensive links to other sites on atmospheric refraction. This website by Victor Reijs presents a very technical view of atmospheric refraction with empirical as well as formulas for the position of the sun at rise and set. Unlike modern calendars that define the start of a season on a Solstice or Equinox, the Celts perceived Solstices and Equinoxes as events occurring mid-season, with the seasons actually beginning and ending on the Cross Quarters." Interesting bibliography on ancient American petroglyphs and alignments.Įver wonder how atmospheric refraction affects the position of the sun? Especially at sunrise and sunset. Uncommon information is provided such as "Old Celtic calendars observed Cross Quarters, approximately midway between each pair of adjacent Equinox and Solstice days. Want to know the exact time of sunrise in 2000? Or Carl Lehrburger's account of an equinox site with a noon hour sundagger formed by fallen rock? Then this site is for you.
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