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Over the past decades and even centuries, the astronomical community hasaccumulated a signif-icant heritage of recorded observations of a great manyastronomical objects. Those records con-tain irreplaceable information aboutlong-term evolutionary and non-evolutionary changes in our Universe, and theirpreservation and digitization is vital. Unfortunately, most of those data riskbecoming degraded and thence totally lost. We hereby call upon the astronomicalcommunity and US funding agencies to recognize the gravity of the situation,and to commit to an interna-tional preservation and digitization effortsthrough comprehensive long-term planning supported by adequate resources,prioritizing where the expected scientific gains, vulnerability of theorigi-nals and availability of relevant infrastructure so dictates. Theimportance and urgency of this issue has been recognized recently by GeneralAssembly XXX of the International Astronomical Union (IAU) in its ResolutionB3: "on preservation, digitization and scientific exploration of his-toricalastronomical data". We outline the rationale of this promotion, provideexamples of new science through successful recovery efforts, and review thepotential losses to science if nothing it done.

Historical astronomical data: urgent need for preservation, digitization enabling scientific exploration