CyberSky 4.0 出来了，要的下啊

http://www.cybersky.com/


下载地址  http://www.cybersky.com/cybersky_trial.exe


Features
CyberSky lets you do all of the following, and much more.

View colorful, detailed maps of the sky as seen from any location on the Earth at any moment from 15,000 BC to 15,000 AD.
Display constellations, asterisms, about 300,000 stars, 2,200 deep-sky objects, the Milky Way, the Sun and Moon, planets, Jupiter’s four brightest moons, Saturn’s eight brightest moons and rings, asteroids, comets, and meteor showers.
Display proper-motion vectors, which are lines that show the speeds and directions that the stars are moving.
Display the cross-section of the Earth’s shadow at the distance of the Moon, which lets you see the circumstances of lunar eclipses.
Display the paths of the Sun and Moon, planets, asteroids, and comets with respect to the background stars and the horizon.
Display equatorial, horizontal, ecliptic, and galactic coordinate-system lines, as well as the positions of the coordinate-system poles, the equinoxes and solstices, and other important points in the sky.
Display finder circles like those you see through a Telrad reflex sight or a similar sighting device.
Save maps to files and open them again later, just like saving and opening documents in a word processor. Many sample maps are included. Save maps as Windows bitmap, GIF, JPEG, PNG, and TIFF images.
Print beautiful, high-quality maps on any printer, in black and white or in color. Use print preview to see what a printed map will look like before you print it.
Use night-vision mode to preserve the dark adaptation of your eyes while using the program outdoors.
Use the animation feature to watch objects move across the sky, solar and lunar eclipses take place, moons revolve around Jupiter and Saturn, and many other astronomical events.
Display an overhead view of the planets and their orbits around the Sun. This view appears in a separate window, so you can watch the planets revolve around the Sun and see them move across the sky at the same time.
View detailed information about objects, as well as information about the seasons of the year, the beginning and end of twilight, the visibility of the planets, and the phases of the Moon.
System requirements
To use CyberSky, you need a computer that meets the following system requirements.

Microsoft Windows 98, Windows Me, Windows 2000, Windows XP, Windows Server 2003, or Windows Vista operating system
48 MB of available RAM
20 MB of available hard-disk space
800x600 or higher screen resolution and 16-bit or higher color quality

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