This program simulates the collision of an asteroid or a comet with any planet in Solar System. Users can pick one of the nine planets in the Solar System or the Earth's Moon, choose the composition and diameter (size) of the projectile, and choose the speed of the projectile. Approximate results are returned. Full description.

This web-site contains three programs for calculating various information about our solar system. The Planetary Calculator allows users to compare the mass, size, spin periods, surface gravity and orbital information for each of the nine planets. Users can also create their own formulae to compare different combinations of properties. The Satellite Calculator allows users to compare physical and orbital ... Full description.

This program calculates and depicts the effects of a rogue star coming through our solar system. Users adjust the date, the rogue star's mass, approach distance in astronomical units (AU) and flyby speed to run an animation of what would happen to the planets under the specified conditions. Full description.

This Java applet creates a model of a solar system with user-defined data. Users can create a solar system with up to four planets, choosing the star type at the center of the solar system, planet name, size, eccentricity of orbit and distance from the star. This site then calculates these factors to produce a graphic of the solar system with details about each planet such as its atmosphere, temperature, ... Full description.

This interactive tool allows users to view sky maps for different latitudes during different times of the year. It produces a printable sky map for any given latitude, month, and time. The map indicates direction (north, south, east, west), constellations (which can be clicked for detailed information), and other objects within the sky, such as galaxies and Messier Objects. This website is part of ... Full description.

This Ocean Research Institute, University of Tokyo website publishes interactive plate motion calculators based on three different models: NUVEL-1 Relative Plate Motion Model, NUVEL-1A Relative Plate Motion Model, and HS2-NUVEL1 Absolute Plate Motion Model. Visitors select plates from a drop down list, input latitude and longitude, and press a button to execute the calculation. The calculator returns ... Full description.

The United States Naval Observatory (USNO) data services page provides tools for calculating the times of sunrise, sunset, moonrise, moonset, and civil twilight, as well as rise and set times for major solar system objects and bright stars. There is a section of lunar data that includes dates of its primary phases, a tool for calculating the illuminated fraction, and a graphic that displays the apparent ... Full description.

This Java applet displays the phases of the Moon for calendar years 1971-2052 by month. Clicking on the day and phase gives the phase and lumination at local noon. A downloadable version is also available. Full description.

This site contains Stereographic Projection and Rose Diagram plotting packages (GEOrient); a structural and drillhole calculator (GeoCalculator); strain, and shear zone calculators; geological field database information; and Geographic Information Systems (Mapinfo) software for plotting structural symbols on maps (GeoMapSymbol; previously GeoSymbol]. There are also several animations for teaching ... Full description.

This is the home site for LMNO Engineering, Research, and Software, Ltd. The main features of this site are on-line calculations for fluid flow, flow measurement, and unit conversions. There are over forty equations grouped by the following categories: Hydrology, Groundwater/Porous Bed, Volume, Open Channels, Pipe Flow, and More Programs. Some equations are available for free, while others require ... Full description.