ハーバード・スミソニアン天体物理学センター
The Digital Access to a Sky Century @ Harvard (DASCH) is a project to preserve and digitize images recorded on astronomical photographic plates created before astronomy became dominated by digital imaging. It is a major project of the Harvard–Smithsonian Center for Astrophysics. Over 500,000 glass plates held by the Harvard College Observatory are to be digitized. The digital images will contribute to time domain astronomy, providing over a hundred years of data that may be compared to current observations.