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3-D Interactive Solar System  
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
Sun & Earth  
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
Construction of orbits using MATLAB  
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
Building a Library of Reusable Java Components for Astronomy  
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
Gravity and Orbit simulation  
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
Interactive planetarium  
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
Newtonian Gravitation and the laws of Kepler  
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
Demonstration of Moon Phases  
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
GeoAstro Applet Collection  
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
Sunrise & Sunset Applet  
The applet displays the times of sunrise and sunset (from the GeoAstro Applet Collection).
Submitted: Nov 03, 1999
The Moon  
This applet illustrates a moon. It describes a size, distance, brightness and phases of the moon.
Submitted: Nov 04, 1999
Declination and Equation of Time  
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
Sun Data Applet  
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
Stig's Sky Calendar  
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
Earth Viewer  
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
Why Is the Sky Dark at Night?  
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
Jupiter moon positions  
This Java applet shows the positions of the four Galilean satellites of Jupiter.
Submitted: Nov 04, 1999
Day & Night  
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
Grok Solar Calculator  
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
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
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
Solar Eclipse  
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
Phoon - show the current PHase of the mOON (Jef Poskanzer)  
Shows the moon in its current phase, including the partial lighting of the dark side by reflected earthlight.
Submitted: Nov 04, 1999
NCSA Astronomy Digital Image Library  
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
Foucault Test Image Analyzer  
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
Akkana's Star Chart  
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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