Abstract
The largest public observatory in Japan, Gunma Astronomical Observatory (GAO), is now under construction. The purposes of this observatory are popularization, education and research of astronomy and astrophysics. The main telescope is a 150-cm reflector equipped with a public-viewing eyepiece, a highresolution spectroscope, a near-IR camera, and so on. In this article, I will report an outline of the observatory and our plan for education and popularization of astronomy and astrophysics via the internet.