This applet is designed to show the user the current positions of the Sun and Moon, as well as locations of day and night, on a map of the Earth. The Moon phase as well as Sun declination are indicated on the map. A downloadable demonstration of this applet is available. Full description.

This applet shows the current (realtime) Sun position as seen from a polar view above the North pole. The elevation and azimuth of the Sun are given, and a brief description of celestial coordinates and celestial spheres is covered as well. A demonstration of this applet is available to download. Full description.

This applet calculates the approximate times of sunrise and sunset from a geometrical construction for any location and date. Users can select their locations from the menu list, enter the coordinates manually, or click into the right half of the circle to set the latitude. Month and date are chosen from the menus. There is also a summary table that compares the applet's values to those calculated ... Full description.

This units conversion tool for science students and scientists allows users to enter a numerical value and a permissible unit (or select from a menu) and subsequently select the "wanted" unit from another menu. There is a separate tool for temperature conversions. It is also available in German. Full description.

This world population clock is an applet that uses a logarithmic equation obtained through a statistical analysis of data from the U.S. Bureau of the Census. The clock takes into account both births and deaths. You can compare the current world population to any date since 1970. Full description.

This online calculator computes radioactive decay, timed decay, and timed solid disposal for a databank containing 116 isotopes. It also features University of British Columbia disposal limits and a unit converter and date/time calculators. These tools calculate the half-life for selected isotopes; radioactive decay final activity, given the initial activity and decay time; the decay time, given the ... Full description.

This Java applet calculates three views of the bright planets (Mercury, Venus, Mars, Jupiter, Saturn) and the Moon. It displays a diagram showing rise and set times over the year, a view at local horizon, and a view of the ecliptic plane. Full description.

This program calculates tectonic plate motion at any location on Earth using one or more plate motion models. The possible plate motion models are GSRM v1.2 (2004), CGPS (2004), HS3-NUVEL1A, REVEL 2000, APKIM2000.0, HS2-NUVEL1A, NUVEL 1A, NUVEL 1, and two models for ITRF2000. Plates or frames are selected from dropdown lists or can be entered by the user. Position coordinates can be entered in geographic ... Full description.

Users can learn about their own personal environmental impacts by using the eco-footprint calculator. The basic calculator is a short quiz which estimates how much productive land and water users need to support what they use and discard. It consists of questions relating to food, transport, shelter and goods/services and will provide a quick and relatively accurate ecological footprint for an individual ... Full description.

This calculator allows users to calculate their ecological footprint in terms of trees required to sequester the carbon from carbon dioxide emissions produced by household use and transportation. Exact emissions figures or national averages can entered into the calculator, and the amount of carbon dioxide generated by burning of fossil fuels is calclulated, as well as the number of trees it will take ... Full description.