…continuedFreeware from Sky & Telescope
Mars Previewer II
Leandro Rios, an amateur astronomer in Argentina, created this handy utility for Mars watchers. Rios based his freeware program which displays the central meridian and angular size of the red planet for any date and time on the algorithm used in MARS.BAS (in the S&T Basic Programs listings). The program is a 32-bit application (Windows 95 and higher).
After you download mp201.zip (3.0 megabytes), unzip it and run setup.exe to install the software. (To extract the files, use an uncompressing utility, such as 7-zip or StuffIt Expander). NOTE added July 3, 2003: We obtained our copy of mp201.zip directly from the author, months before a virus-infected copy was posted on AstronomySight.com and publicized by Astronomy magazine. Our copy of mp201.zip is certified virus free!
When you run Mars Previewer, make sure you enter dates in DD/MM/YYYY format and set your time zone relative to Greenwich Mean Time (positive numbers to the west, negative to the east). If you have any questions about the program, you can contact Rios by e-mail at firstname.lastname@example.org.