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Cylinder or Pillar Sundial (1)


Large applet version
(27.5cm x 17.5cm, diameter 9cm)

The hour lines have been corrected for both longitude and the equation of time. The sundial indicates the clock time:
blue lines before noon, the red lines after noon. The green line (lowest) is the transit time (local noon).

More sundial applets...


You may use the keys s, h, d, w, m to increase the minute,  hour, date, week, or month,
or
Shift key and s, h, d, w, m to decrease the minute,  hour, date, week, or month.
Click the applet first, and check the box "Sun"

gnomon

The length L of the gnomon must be equal to the distance of the horizontal lines for 45° and 0°

pillar

menu
Choose view options.


Reading the time:
The gnomon, attached to a movable top, and is set over the vertical line of the date. Then the cylinder is turned until the shadow is vertical and over the line. Read the time using the hour lines.

The date lines:

date
pillar

sundial

Sun Transit altitude time

Sunrise Sunset


Web Links

The Sundial Primer: Cylinder Sundial

Die Turm-Sonnenuhr (Astromedia)



Last Modified: 2013, Feb 05