![]() ![]() 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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