Читать книгу Triumphs and Wonders of the 19th Century: The True Mirror of a Phenomenal Era - James P. Boyd - Страница 35

Table of Contents

The Royal Observatory, at Greenwich, England, was founded by Charles the Second in 1675. Its main purpose was to extend astronomical knowledge, so that navigators might better find the position of their ships at sea. This institution retains its prominence. All the longitudes on our maps are reckoned from it, and Greenwich time is used on every ship that traverses the ocean. The “Nautical Almanac,” issued by the Observatory, was an indispensable part of the outfit of every sea captain until, in 1852, the United States provided its own American Ephemeris, a collection of tables of the motions and places of the sun, moon, and planets for every day and hour, and occultations of the stars, with rules for calculating longitude and the like.

Many valuable observations of the transit of Venus in 1769 were made at points near Philadelphia; but almost seventy years ensued before America witnessed the erection of any permanent buildings devoted to the purposes of this science.

President John Quincy Adams, who was highly versed in science, and held the position of president of the American Academy of Arts and Sciences in Boston for twenty years, often urged this matter on the attention of Congress, but without success.

President Thomas Jefferson, who was also a man of no small scientific information, as evidenced in his keeping a systematic weather record at his home in Monticello, Virginia, proposed an elaborate survey of the national coast. This was authorized by Congress in 1807. In the year 1832, in reviving an act for the continuance of the Coast Survey, Congress was careful to append the proviso “that nothing in the act should be construed to authorize the erection or maintenance of a permanent astronomical observatory.”

The expected return of Halley’s comet in 1835 again stimulated popular interest in the science, and aroused an intense desire to provide serviceable instruments, and to establish buildings suitable for their care and use. To Williams College, Massachusetts, belongs the honor of erecting, in 1836, the first astronomical observatory on this continent. Under its revolving dome was mounted an Herschelian telescope of ten feet focus, which later became the property of Lafayette College, where it is still preserved. In 1843, John Quincy Adams laid the corner-stone of the Longworth Observatory in Cincinnati, and delivered a commemorative address, his last great oration. The construction of the United States Naval Observatory at Washington soon followed, and before 1850 there were fourteen observatories established in this country. Nearly all the instruments they contained were made abroad, chiefly in Munich and London. Since then the number has risen to two hundred recognized observatories, of which twenty-four are of superior order, where systematic work is daily pursued, and the results are regularly published in book form. About two hundred observatories exist in other nations.