<p><strong>GIS (Geographical Information System) is a computer support system that represents data using maps. It helps people access, display and analyse data that has geographic content and meaning. For those not familiar with GIS, it u

用VRML编写的虚拟现实月球围绕地球转.有宇宙,有地球,有月球-VRML prepared by the virtual reality the moon around the earth. The universe, the earth, moon

主程序：VRML3-6月亮围绕地球转动.wrl 虚拟现实-Main program: VRML3-6 moon rotate around the Earth. Wrl Virtual Reality

地球的自转和公转，以及月球绕着地球的旋转，虚拟现实的课程设计-Earth' s rotation and revolution, and the rotation of the Moon around the Earth, the virtual reality course design