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astronomy
Astronomy
![HUES, Robert. D[enis] HENRION, translator.](/photos/551/main/551.jpg "HUES, Robert. D[enis] HENRION, translator.")
Hues had studied at Oxford where he became acquainted with Richard Hakluyt and later, Walter Raleigh and Thomas Harriot, before taking part in a voyage to Newfoundland. In five parts, the book describes the practical uses of the globes designed by Molyneux and, especially, how mariners could find the sun’s position, latitude, course and distance, amplitudes and azimuths, and time and declination. The fifth part describes the use of rhumb lines in navigation. The translation is by Denis Henrion, the Paris mathematician remembered for his edition of the works of Viète and for the introduction of the calculating device known as the proportional compass to France. Henrion’s is a faithful translation with numerous interpolations of his own (indicated by italics). In these, Henrion adds several practical details to the methods of calculation but also takes the opportunity to advertise his Cosmographie, which was not to appear until two years later. At several points he affirms Hues’ text while stating ‘comme nous avons enseigné en nostre Cosmographie.’ The notes on the operation of the proportional compass promised by the title are confined to very sparse remarks on how a lengthy calculation, for example, could be achieved simply with the compass. They would appear to be an attempt to advertise another of Henrion’s works, Usage du compas de proportion (also 1618) and perhaps the instruments themselves. see full details...
Mouchez was director of the Paris Observatory and commissioned two young astronomers, Prosper and Paul Henry, to prepare a photographic star atlas. "Arago had embarked on a program of improving Lalande's catalog of 50,000 stars with the aid of new, more precise measurements. Mouchez published the part observed up to 1875. Most notably, however, he enlisted the support of Sir David Gill, director of the Cape Observatory, to bring about an international astronomical congress at Paris in 1887. It was there decided to produce photographically a large-scale general map of the heavens and to establish a catalog giving the position and brightness of all stars up to the eleventh magnitude. Two young astronomers at the Paris observatory, the brothers Prosper and Paul Henry, both of whom were also talented opticians, had just completed an astrograph and Mouchez had it adopted for this gigantic undertaking, which took more than fifty years" (DSB). The first photograph (the frontispiece) depicts the moon's surface around the crater Eratosthenes; the second is of the Hercules cluster of stars; the third is a time-lapse series of depicting Jupiter, showing the rotation of the red spot; the fourth shows the rings of Saturn and the bands of Jupiter. This copy is inscribed by Mouchez to General Brugers, the future military governor of Paris. see full details...
