Think Astronomy Where is M13 v1.5 (天文星体分析):
Think Astronomy Where is M13 是一款天文星体3D显示及其物理特性学习软件。其独特的三维视角显示功能再现了银河系星团系在地球上不可能观测到的真实景象。这是windwos版本

Where is M13? is a new and unique astronomy application that helps you visualize the 3-D locations and physical properties of common deep sky objects. This perspective is rarely discussed in astronomy books and software products on the market, which focus mainly on an object's apparent data such as its look, visual magnitude, apparent size, right ascension and declination. Where is M13? aims to address this important need.