How to Keep the Clock Right by Observations of the Fixed Stars With a Small Telescope (Classic Reprint): Together with Tables of Stars Arranged to ... Apparent Transits, to the End of the Century - Tapa blanda

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Excerpt from How to Keep the Clock Right by Observations of the Fixed Stars With a Small Telescope: Together With Tables of Stars Arranged to Show, by the Use of a Little Arithmetic, the Mean Solar Time of Their Apparent Transits, to the End of the Century

The second class consists of observations on the meridian. This class must, however, be subdivided into two divisions; the first, when the observations are made with good transit instruments, which are occasionally examined for errors, and of which the errors are known and allowed for. The observa tions by such instruments are the most perfect of any - but the instruments are costly; they require and deserve careful treatment, and trouble and skill are necessary in detecting the errors.

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