the latitude or longitude of a place, with many other curious problems. In the selection of these, for the first edition, I have to acknowledge the assistance I received from an ingenious friend. The Editor to this sixth edition, thinks it necessary to inform the Reader, that this work has been again carefully revised by him, all observed errors corrected, new astronomical discoveries inserted, including a plate of the path and descriptions of the two recent very remarkable comets, and such other additions made, as appeared necessary to the information of the beginner, and the use of the preceptor. On the decease of our worthy author, some years back, his widow, not meeting with a liberal and adequate offer, either by private treaty, or public auction, for the copy-rights of her husband's valuable works; on her application to the Editor and his Brother, by an advanced tender, they became, impartially, the purchasers. This explanation, will prevent the effect of an unjust insinuation or misrepresentation. It is hoped, that the Editor, without the imputation of arrogance to himself, may add, that the works have been rendered the most correct in his own department, by thus coming under his attention and revision. Holborn, August 1, 1812. W. and S. JONES think it proper hereby to inform the reader, that there are now completed two entire new sets of engraved plates, for Globes of eighteen and twelve inches diameter. The many recent geographical and astronomical discoveries have rendered the old globes inaccurate and obsolete, and new ones indispensably necessary. On the 18-inch Terrestrial, are inserted all the lastest discoveries from the voyages of Capt. Cook, Vancouvre, Perouse, &c. engraved from an accurate drawing by Mr. Arrowsmith, and all the names of the places delineated in a clear and distinct manner. On the Celestial, is depicted the exact places of more than 6000 stars, clusters, planetary, nebulæ, &c. communicated by Dr. Herschel and other astronomers, and calculated, in position, for the present century, or the year 1800, by W. Jones. The size of these Globes, which is considered of the dimensions the most manageable, renders them comprehensive of many particulars not to be contained in smaller ones. The graduation of the great circles are to 20 minutes of a degree; and by simple and improv ed hour circles, the time is shewn to a few minutes. The Globes are so constructed, as in the simplest manner to be capable of all solutions® that it is possible for globes to give, and the names are in the English language. The general prices, per pair, are from 8 to 18 guineas, according to the frames, mounting, &c. as may be seen in W. and S. Jones's Catalogue of instruments annexed. The 12-inch Globes are reduced copies of the above 18-inch, and contain rather more than half the countries, stars, &c. that are upon the 18-inches. The graduations of the great circle are to 30 minutes, or half a degree, The price in plain frames, the pair, is 4 guineas, and 5 shillings for the addition of a compass fitted to both horizons of the Globes. In mahogany claw-feet frames, 6 guineas. The Globes may be packed securely in packing cases, so as to be conveyed safely to all parts of the world. TABLE OF CONTENTS. PAGE Of the Solar System, as seen from the Sun Of the Celestial Sigus and Constellations Of the Planets, as seen from the Sun.... An Explanation of the Phenomena which arise from the Herschel, on the Construction of the Universe, &c. Of the tellescopic Appearance of the Planets. Of the Precession of the Equinoxes 3. To find all those Places where it is noon at any given Hour of the Day, in any given Place 5. At any given Hour where you are, to find the Hour at a Place proposed.... 7. To find all those Places which have the same Latitude with 8. To find the difference of Latitude between any two 9. The Latitude and Longitude being known, to find the Place.... .. ibid. 16. To exemplify the Sun's altitude..... 17. Of the Sun's Meridian Altitude |