From NASA, Skyview is a virtual observatory which allows users to view images of any part of the sky "in all regimes from Radio to Gamma-Ray." Users can employ a variety of interfaces to enter a desired position, scale, and orientation. By calculating the coordinates it receives, Skyview returns a made-to-order image of a specific portion of the night sky. Interfaces include Non-Astronomer, Basic, Advanced, Java, and X-Windows. The Telnet link requires a login which is provided (login: x-ray). The site includes a good introduction, general help information, and an FAQ. To make the most of this impressive facility, a little prior knowledge of astronomy and sky coordinates is required.
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