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3-D Interactive Solar System Update Link / Bad Link? 
This Java applet shows the orbits and positions of the planets right now. The view can be tilted, rotated, and zoomed in and out.
Submitted: Nov 05, 1999
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3D Model of the Solar System Update Link / Bad Link? 
This Planetarium calculates the orbits as ellipses following the old laws that Keppler, Huygens, Leibnitz, and others postulated in the 17th century, and that are still the cornerstones of Astrodynamics. The real orbits are pretty close to these ones.
Submitted: Nov 05, 1999
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Sun & Earth Update Link / Bad Link? 
This interactive Java applets 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 (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
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Construction of orbits using MATLAB Update Link / Bad Link? 
Construction of orbits, in the three-body problem, using Matlab6-R112. The originality lies in the choice of initial conditions.The program " Orbitode" (present in the demos) could be modified to calculate for example the Jacobi constant or the velocities, as i have done.I have designed some short programs in astrodynamics (Matlab and MapleV) to be used, eventually, in teaching.(T.Négadi)
Submitted: Oct 01, 2001
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Building a Library of Reusable Java Components for Astronomy Update Link / Bad Link? 
This document presents a plan for building a library of reusable Java components for use in astronomy. The goal is to provide a flexible, extensible framework of Java Beans and class libraries that can be used by applications to display and manipulate images, catalogs or other astronomical data in various formats. The sources will be freely available and developers are encouraged to contribute new components and suggestions.
Submitted: Nov 05, 1999
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Gravity and Orbit simulation Update Link / Bad Link? 
This applet simulates Newtonian mechanics with gravity. The objects are massive pieces of text (with their center of mass located at the lower left corner of the word) that feel gravitational forces. The "SU" and "Physics" have significant mass, while the dots (periods) have negligible mass -- they are so-called 'test particles'.
Submitted: Nov 04, 1999
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Interactive planetarium Update Link / Bad Link? 
Welcome to Your Sky, the interactive planetarium of the Web. You can produce maps in the forms described below for any time and date, viewpoint, and observing location. If you enter the orbital elements of an asteroid or comet, Your Sky will compute its current position and plot it on the map. Each map is accompanied by an ephemeris for the Sun, Moon, planets, and any tracked asteroid or comet. A control panel permits customization of which objects are plotted, limiting magnitudes, colour scheme, image size, and other parameters; each control is linked to its description in the help file.
Submitted: Nov 04, 1999
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Newtonian Gravitation and the laws of Kepler Update Link / Bad Link? 
Text, graphics and java applets are the tools used in this page to explain Kepler's Laws and Newtonian Mechanics. This is just one page in the WWW site for the course "Astronomy 161: The Solar System", at the University of Tennessee.
Submitted: Nov 04, 1999
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Demonstration of Moon Phases Update Link / Bad Link? 
This applet shows the different phases of the Moon. The user can select both the phase and the point of view. The source code is also available.
Submitted: Nov 04, 1999
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GeoAstro Applet Collection Update Link / Bad Link? 
Run my Java Applets for detailed solar and lunar data and observe the daily and annual path of the sun and moon for any location.
Submitted: Nov 11, 2001
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Sunrise & Sunset Applet Update Link / Bad Link? 
The applet displays the times of sunrise and sunset (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
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Orbit applet Update Link / Bad Link? 
The applet has two active display regions. The first shows the trajectories of two bodies orbiting a central object. Below this is a plot of the effective potential curves for the two bodies (two curves since the bodies have different angular momemta).
Submitted: Nov 04, 1999
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The Moon Update Link / Bad Link? 
This applet illustrates a moon. It describes a size, distance, brightness and phases of the moon.
Submitted: Nov 04, 1999
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Stellar Evolution Update Link / Bad Link? 
This applet shows the evolution of stars in the H-R diagram from main-sequence to the red giant phase.
Submitted: Nov 04, 1999
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Declination and Equation of Time Update Link / Bad Link? 
This applet (from the GeoAstro Applet Collection) lists the current (correct to the minute) declination of the sun. The source code is also available.
Submitted: Nov 03, 1999
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Sun Data Applet Update Link / Bad Link? 
The applets computes the times of sunrise and sunset, and more astronomical data, which is updated every second (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
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Stig's Sky Calendar Update Link / Bad Link? 
The Sky Calendar display is split into to major parts, a graphic display and text display. These parts display much of the same information, both display the sunrise/sunset, moonrise/moonset and twilight times. The graphic display will show this information for the entire Month and the text display will display it one day at a time.
Submitted: Nov 04, 1999
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Earth Viewer Update Link / Bad Link? 
Earth Viewer was written primarily for elementary school students. It shows the daytime and nighttime portions of the Earth for any day of the year.
Submitted: Nov 04, 1999
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Why Is the Sky Dark at Night? Update Link / Bad Link? 
This is a colorful Java applets that guides you through the fascinating physics problem: why is the sky dark at night?
Submitted: Nov 05, 1999
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Jupiter moon positions Update Link / Bad Link? 
This Java applet shows the positions of the four Galilean satellites of Jupiter.
Submitted: Nov 04, 1999
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Jupiter's Moons and more Astonomy functions Update Link / Bad Link? 
Java Application which shows smooth animation of Jupiter's moons with eclipses and shadow transits. Print a forecast table of Galilean Events (accurate to 1 minute).
Submitted: Aug 15, 2000
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Day & Night Update Link / Bad Link? 
This Java Applet shows the day and night regions on a world map, computes the declination and Greenwich hour angle of the sun, the shadow of a vertical gnomon, the elevation and azimuth of the sun (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
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Central force motion Update Link / Bad Link? 
This applet illustrates the orbits of particles in a variety of color-coded forces.
Submitted: Nov 04, 1999
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Binary Star System Update Link / Bad Link? 
This apple shows the orbits and velocities of two stars revolving (orbiting) around one another.
Submitted: Nov 04, 1999
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Grok Solar Calculator Update Link / Bad Link? 
The Grok Solar Calculator is a CGI (Common Gateway Interface) application that generates for a given location and date, either a formatted HTML table of solar coordinates, a formatted Text table of solar coordinates or a GIF image plot of solar altitude vs. azimuth... Although intended as an aid for constructing sundials the Solar Calculator can also be used for surveying purposes, computing solar array effectivness...
Submitted: Nov 04, 1999
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StarGazer Update Link / Bad Link? 
The StarGazer applet lets the user view stars and constellations, with the ability to change the time, date and latitude shown. Click on a star to get some basic information (name, constellation, rank and magnitude) regarding that particular star.
Submitted: Nov 04, 1999
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Daylight Update Link / Bad Link? 
This Java applet displays a diagram with the times of sunrise and sunset and a horizon view (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
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Stellar Evolutionary Tracks Update Link / Bad Link? 
This applet is meant primarily for undergraduate /graduate Astronomy students, as a help in visualizing (any) stellar evolutionary tracks. You can now follow a star on its track, having at each moment displayed its Age, Luminosity, Radius and EffectiveTemperature. You can pause the applet at any moment, if you want to read more carefully the displayed values.
Submitted: Nov 04, 1999
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Many moons Update Link / Bad Link? 
Here's a simulation of a collection of (randomly initialized) moons, acting under the universal law of gravitation, with mass proportional to radius cubed.
Submitted: Nov 04, 1999
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Solar Eclipse Update Link / Bad Link? 
The total solar eclipse on March 8/9 1997 will be visible from eastern Siberia, with a partial eclipse observable from a much larger area, including China, Japan, and Alaska. The animation on the left is how the total eclipse will appear from 129°E. Longitude 57°N. Latitude, just south of Yakutsk (the time is Universal Time). The animation on the right shows the Moon's shadow on the Earth, and demonstrates the area of total eclipse (small circle) and partial eclipse (large circle). The animations are close to being, but are not quite, in synchronization.
Submitted: Nov 04, 1999
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Phoon - show the current PHase of the mOON (Jef Poskanzer) Update Link / Bad Link? 
Shows the moon in its current phase, including the partial lighting of the dark side by reflected earthlight.
Submitted: Nov 04, 1999
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NCSA Astronomy Digital Image Library Update Link / Bad Link? 
This paper, from the National Center for Supercomputing Applications (NCSA), University of Illinois, talks about the writers' experience with using Java to create data browsing tools for use with the Astronomy Digital Image Library (ADIL) and related digital library projects at NCSA. More from the abstract: " We give an overview of our Image Data Browser, a generalized tool under development through a collaboration with the NCSA/NASA Project Horizon in support of access to earth and space science data... We see such a tool filling an important niche as a pipeline from a data repository to specialized, native data analysis software (e.g., IRAF, AIPS)."
Submitted: Nov 05, 1999
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Day and Night Sky Update Link / Bad Link? 
The applet TLPSHorizon listens to the Observer and the TimeBase applets. By changing the epoch or the observer, the visualization applet updates the new positions. Remember that time and date in the Calendar applet (TimeBase) represent UTC.
Submitted: Nov 04, 1999
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Eclipsing Binary Stars Update Link / Bad Link? 
This applet shows two stars revolving about one another and the light curve for the system.
Submitted: Nov 04, 1999
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Foucault Test Image Analyzer Update Link / Bad Link? 
Calculates the shape of a telescope mirror from a sequence of Foucault test images. Java-based GUI simplifies entering and organizing measurement data.
Submitted: Mar 10, 2003
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Akkana's Star Chart Update Link / Bad Link? 
Here's a Java star chart program which starts out aimed at one of the most interesting areas of the night sky currently visible at this time of year. You can show other areas of the sky by editing the coordinates or scale, then hitting return. Click on an object to display more information about that object. The database contains stars down to about magnitude 7.
Submitted: Nov 04, 1999
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Multiple Choice Test Update Link / Bad Link? 
You can test your knowledge with a Multiple Choice Test of General Astronomy. The test has 12 questions.
Submitted: Nov 04, 1999
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Astronomy Hub - International Astronomy and Space Forum Community Update Link / Bad Link? 
The International Astronomy and Space Forum Community, Where Astronomers and Space-Minded Enthusiasts Meet.
Submitted: Jul 05, 2005
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SETI@Support Update Link / Bad Link? 
Java support tool for SETI@home users that provides a graphic display of the data and automatically logs analyzed data.
Submitted: Nov 05, 1999
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Explorit's Astronomy Quiz 1 Update Link / Bad Link? 
There are several different kinds of JavaScript quizzes here. Some give a score, some give individual answers, and some give all the answers at the same time when you ask for them.
Submitted: Nov 05, 1999
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Explorit's Astronomy Quiz 2 Update Link / Bad Link? 
There are several different kinds of JavaScript quizzes here. Some give a score, some give individual answers, and some give all the answers at the same time when you ask for them.
Submitted: Nov 05, 1999
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