Mars24 is a Java program and browser applet which displays a Mars "sunclock", a graphical representation of the planet Mars showing its current sun- and nightsides, along with a numerical readout of the time in 24-hour format.Other displays include a plot showing the relative orbital positions of Mars and Earth and a diagram showing the solar angle for a given location on Mars.Mars24 software runs on many different types of computers, including Windows, Mac OS X, Linux, and more. The associated MER Spirit/Opportunity Clock Applet requires only Java 1.1.8 and is compatible with many older web browsers, but it does not include the sunclock or other graphic displays of Mars24. Requirements: · Java Runtime Environment (JRE) 1.5 or later