14,838 deep-sky objects (Messier, NGC, IC, Caldwell, Sharpless, Barnard) and 118,218 Hipparcos stars, 411 of them named, with 695 constellation lines. The Sun, Moon and planets are computed for the date shown. Drag to pan, scroll to zoom, click an object to select it.
Rotation is the camera angle, so the box turns exactly as the frame will.
Panel overlap is how much neighbouring mosaic frames share. A 1×1 grid is a single frame.
Star positions are propagated from the Hipparcos proper motions to the epoch you choose and precessed to that equinox, so any date works — not just today.
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