Windows astronomy software ranked by popularity
Sun-Moon-Calendar for 110 Countries, Holidays, Signs of Zodiac, Saint's Days
Similar to 3D games VRPresents Software on Mars Exploration Rover Spirit Mission
This utility can convert a gregorian date into julian day format and vice versa
View a dark energy inside Solar system on your dektop with this screensaver!
Visit stars & planets, see galaxies & nebulas, try this 3D software planetarium!
The Sun & Moon Calculator displays solar and lunar data throughout the day.