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An analemma is the figure-of-eight shape that results if the Sun's position in the sky is recorded at the same time of day throughout the year. The gnomon of a sundial draws a similar figure. |
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Make
your
own
sundial
just
by
folding
a
sheet
of
paper. |
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| 4. Cylinder
Sundial |
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Java applet drawing a cylinder sundial indicating clock time. | |
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| 5. Sundial Box |
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Java
applet
drawing
an
hour
scale
for
a
Compact
Disk. |
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| 6. Spider Sundial |  |
A horizontal sundial using a vertical gnomon. It depends on the azimuth angle of the Sun. | |
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| 7.
Spider: Vertical and Polar Pointing Gnomon |
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A horizontal sundial using a vertical gnomon. It depends on the azimuth angle of the Sun. | |
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| 8. North Finder |  |
This horizontal sundial combines two different principles and is self-aligning to true north. | |
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| 9. Bifilar Sundial |  |
This sundial uses two
non-intersecting threads parallel to the horizontal dial plane. The
upper thread (distance a above the plane) is oriented North-South, the
lower (distance b) is orthogonal to the first. The intersection of the
two threads' shadows gives the time. |
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| 10. Cone Sundial |  |
This sundial uses a
horizontal gnomon. The hour lines and the date lines are drawn on to a
cone. |
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| 11. Babylonian, Italian, Unequal Hours Sundial |  |
The Babylonian system
divides the day into 24 equally long hours beginning at sunrise and
ending with the following sunrise. Italian hours begin counting at sunset and ends 24 hours later with the following sunset. |
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| 12. Pingre Sundial |  |
This unique sundial
was invented and designed by the French astronomer Alexandre Guy
Pingré (1711 - 1796). It is similar to the cylinder sundial, but there are multiple gnomons in a horizontal plane, perpendicular to the cylinder. |
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| 13. Daylight Hours Sundial |  |
The gnomon of this
sundial is vertical. The shadow of it's top on the horizontal plane is
used to read the sundial. The declination lines are computed for full numbers of daylight hours which depend on the latitude of the observer and the declination of the Sun. |
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| 14. Sidereal Time Sundial |  |
This horizontal sundial is showing the local sidereal time, which is defined as the hour angle of the vernal equinox. | |
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| 15. Foster-Lambert Sundial |  |
The gnomon produces a circular ring of equiangular hour points. | |
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| 16. Azimuthal
Orthographic Sundial |
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Azimuthal Sundial for both solar and standard time. | |
Additional Applets: |
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| Sun: Declination, Equation of Time, Transit Time |
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Tables, and diagrams. |
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The applets computes the times of sunrise and sunset, and more astronomical data, which are updated every second. |
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The applet displays the times of sunrise and sunset. |
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Equation of Time |
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The applet displays the current declination of the sun and the equation of time. |
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& Equation of Time |
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The applet displays the current declination of the sun and the equation of time. |
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You may edit the applet parameters for your location and the number of lines. |
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You may edit the applet parameters for your location and the number of lines. |
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| SunClock |  |
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| Twilight Clock |  |
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| Spider Sundial |
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On my Home Page: Astronomie by JavaScript Home Page: http://www.jgiesen.de Last
Modified:
2010,
Aug
16 |
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