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Juergen Giesen's GeoAstro Java Applet Collection Run these Java Applets for detailed solar and lunar data and observe the daily and annual path of the sun and moon for any location. For more details and downloads visit the applet pages !

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To run the Applet, click on its name.

Sun, Moon & Earth Applet

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This interactive applet displays the positions of the Sun and Moon on the horizon for any date, time and location, and on a world map with day and night regions. The times of rise and setting, the declination, the Greenwich hour angle of sun and moon and the equation of time, and more data are computed.

Sunshine Applet

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A version of the Sun, Moon and Earth Applet designed to indicate times of maximum risk from ultra violet rays

Analemma Sundial Applet

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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.   Print the diagram to make your own sundial !

Pie Sundial Applet

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Make your own sundial just by folding a sheet of paper.

Sun Shadow Applet

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This interactive applet displays the shadow of an object (building, wall, tree) for any location, date and time.

Sun Plotter Applet

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This applet will give you the (approximate) times of sunrise and sunset for any location and date from a geometrical construction.

Daylight Applet

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This Java applet displays a diagram with the times of sunrise and sunset and a horizon view.

Sun & Earth Applet

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This interactive Java applet displays the position of the Sun on the horizon for any date, time and location, and on a world map with day and night regions. The times of rise and setting, the declination, the Greenwich hour angle and the equation of time are computed.

Sun View Applet

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The Java applet displays the position of the Sun on the horizon for any date, time and location, the times of sunrise and sunset, the declination, the Greenwich hour angle of the sun and the equation of time.

Day & Night Applet

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This Java Applet shows the day and night regions on a world map, and computes the declination and Greenwich hour angle of the sun, the shadow of a vertical gnomon, the elevation and azimuth of the sun.     source code included

Sun Data Applet

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The applets computes the times of sunrise and sunset, and more astronomical data, which are updated every second.     source code included

Sun Clock Applet

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This applet displays the times of sunrise and sunset on a clock for any location.     source code included

Sunrise & Sunset Applet

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The applet displays the times of sunrise and sunset     source code included

Declination and Equation of Time Applet

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The applet displays the current declination of the sun and the equation of time.

Current Declination and Equation of Time

The applet displays the current declination of the sun and the equation of time.

Sunrise & Sunset

The hours of daylight and night are indicated by coloured bars.

Azimuth & Elevation

Sun Position Polar

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Sun & Moon Polar Applet

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Moon Phase Applet

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MoonYear Applet

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Seasons Applet