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The Analemma The analemma shows a relationship between the sun's declination and the difference between sun time and mean time. This relationship is of importance in designing a sundial that is to read mean sun time or clock time.
Data generated by the above calculation. Analemma Data Data projected onto a sphere as seen from the outside of the sphere. Analemma Date projected with arrows showing seasonal motion of the sun. Analemma C language program that calculates the analemma and projects the result onto a user defined plane surface. Analemma Projection Results of the analemma projections onto plane surfaces at various places on the earth. Notation is .del.dec where del is the offset of the users meridian from the noon meridian and dec is the users declination. Scrolling will be needed as the images are large. horizontal.0.0 horizontal.5.0 horizontal.0.15 horizontal.0.35 horizontal.0.-35 horizontal.0.66 horizontal.0.80 horizontal.0.35 equatorial.0.35 ie. plane facing the equator vertical.south.facing.0.35 vertical.20.deg.east.of.south.0.35 Photo of Analemma (as seen from inside the sphere and taken over a year period) Courtesy of the photographer, Dennis di Cicco and "Sky & Telescope" magazine www.skypub.com
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