Applet: Daylight Hours Sundial

Astronomy by JavaScript

Sunrise and Sunset Calculator by JavaScript (equations included)

Java Applets

Moon Distance Applet

Pursuing the Sun
A mathematical Astronomy problem

Solar Rotation Applet

How to compute the position of the Moon

New Moon Observer
calculating local conditions for crescent moon sighting

Atmospheric Refraction
and the apparent flattening of the Sun's disc

Eclipse magnitude and obscuration

Solstice Azimuth

Kepler's Applet
Solving Kepler's equation

How to compute the day/night terminator

Sky Map
showing the bright stars and planets of your local sky for any date and time.

Elevation and Azimuth of the Sun

Elevation and Azimuth of the Moon

Sun Azimut at Rise and Set

Feigenbaum Fractal

Planet Applet
The bright planets - Mercury, Venus, Mars, Jupiter, Saturn - as well as the Sun and the Moon (The seven wanderers known to the ancients.), are the subjects of this applet. It provides 6 views: a diagram showing the rise and set times over the year, a view at the local horizon (rectangular and polar), a view of the ecliptic plane, and a sky map and earth map view.
Exercises for exploring solar, lunar, and planetary events are included.

Proper Motion and Precession

Moon
Java applet showing the phase and the age of the moon for any date

Moon Motion
This Java applet computes the motion of the moon (true longitude).

Sky Precession

Water Tube Applet
Physics Quiz

Sun & Moon Azimuth at Horizon

Horizontal Sundial - very easy to make

Night Hours
The applet calculates the duration of dark night hours (civil, nautical and astronomical twilight)

Astronomy applets:
Mercury- and Venus Transit Applets
The Phases of the Inferior Planets (Mercury, Venus)
Planet Orbits
Heliocentric and geocentric Planetary Motion
Cosmology Applet
Hubble Applet

My "GeoAstro Applet Collection"

Sunshine Applet (JARS Top Rated)
An interactive Java applet displaying the hours of most intense sunlight and UV radiation for any location and time. The results can be used to help avoid damage to human skin.

Sun and Moon in Polar Coordinates
Watch the points (azimuth angles) of rise and set of the Sun and the Moon on the horizon as the are changing from day to day
Compare the results with the directions found at the Stonehenge Observatory

Solar and Lunar Standstills

Stonehenge

New Sun & Earth Applet

Moon Phases for a Year

Moon Phase Applet

Seasons Applet (Diagrams added)

Local Sidereal Time Clock (configurable)

Analemma Sunclock Applet Make your own sundial !

Paper Sundial - very easy to make by folding a sheet of paper

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

Sun Plotter Applet
By this applet you get the (approximate) times of sunrise and sunset from a geometrical construction for any location, date, and time.

Sun & Moon Polar: positions of sun and moon in polar coordinates for any location and time

Daylight Applet
This Java applet displays a diagram with the times of sunrise and sunset and a horizon view. A table of all data can be written to the Java Console

Sunrise & Sunset Table Applet

"Sun, Moon & Earth Applet" JARS TOP 25% Rated
This interactive applet displays the positions of sun and moon for any date, time and location on the horizon, and on an interactive world map with day and night regions. The times of rise and setting, the moon's orbital phase and more data are computed.

"Sun & Earth Applet" (JARS TOP 5 % Rated)
my new interactive applet: showing the position of the sun (elevation and azimuth) for any date, time and location and the day and night regions on a world map.

Day & Night - Applet JARS TOP 25% Rated
shows the day and night regions on a world map

The Date of Easter: Computing it by JavaScript

Astronomy

Solar eclipses and the Saros cycle

Astrophysics

How to compute the position of the Sun

How to compute the length of a day

The Moon: orbit and phases

Declination and Equation of Time by JavaScript

Cosmology (Java applet included)

My Astro Sources
Applets, Software, Books, Links

Astronomy by JavaScript:

• Declination, Equation of Time and Length of Day
• Local Sidereal Time Clock
• Sunrise, Sunset and Altitude
• Table Sunrise and Sunset
• Table Sunrise and Sunset (International)
• Approximate Solar Calculations

Observing satellites, my photos of Iridium flares

Atmospheric Phenomena

Miscellaneous

HTML Intro

JavaScript Examples (for download)

Online Games in JavaScript

My Link-Collection