ALEMMA.EXE is freeware, written by H. Sonderegger
and calculates different types of analemmatic sundials.
Last Update: 2017/09/28

The program runs in all Windows systems (64-bit-systems too). It's language is English or German and can be fixed in the program's menu.Version 2.4 calculates a very big variety of analemmatic sundials.

Sundial Types

1. "Common analemamtic sundials" register (local) apparent time but not mean time. They consist of a linear date scale and hour marks situated along an ellipse. Additionally, the new version calculates analemmatic sundials with inclining and/or deviating shadowcasting index.

2. "Very special analemamtic sundials" - suggested by Fred Sawyer - are horizontal 'Craticular' analemmatic sundials. Their (inclined / deviating) index is fixed!

3. The "Split analemmatic sundial" is calculated in this software too. The "Split Dial" is a very special type which registers mean time with very good approximation.

The time marks show time intervals of 60 min, 30 min, 20 min, 15 min, 12 min or 10 min. Further 1, 2, 3 or 6 date marks per month are drawn along the date line. All results are displayed on screen graphically and in tables. Additionally all can be printed on any printer installed in Windows.

All constructions can be saved as dxf- or hpgl-files. Furtheron, tables of ALEMMA can be saved in Excel format *.csv. Help files use the common chm-format. 

... some software information about the calculated analemmatic sundial types.
... here my essay in NASS-Compendium about analemmatic sundials for mean time.
... here Fred Sawyer's article on Elliptical Sundials: General & Craticular.

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