ied to an object-glass micrometer, as well as to an instrument for finding the rising and setting of stars and their positions.
As-tro-nom′i cal clock.
A clock regulated to keep regular time; sidered, not mean.
The first phenomenon recorded in the Chinese annals is a conjunction of five planets in the reign of Tehuenhiu (2514 – 2436 B. C.). The record is verified by Fr. de Mailla and others, and identified with 2461 B. C. Saturn, Jupiter, Mars, and Venus were, with the moon, comprised within an are of about 12° in the constellation Pisces.
The emperor Yao, 2367 B. C., determined the length of the moon's year.
An orrery is said to have been constructed in the second century A. D. in China; the account states that it represented the apparent motion of the heavenly bodies round the earth, and was kept in motion by water dropping from a clepsydra.
The heliocentric, the true theory of oar solar system, was taught in Ancient Egypt, and th
ry of metals.
See speculum-metal in alloys.
A number of the Egyptian mirrors are preserved in the British Museum.
They are from 5 to 14 inches in dimensions.
They are generally furnished with handles, carved into ornamental or symbolic forms; resembling a tress of hair, a hawk's head, a column, a lotus scepter, or the goddess Athor.
Several specimens may be seen in Abbott's collection in the possession of the New York Historical Society.
The mirror with a handle is emblematical of Venus, and is represented on the stones in the ruins of Al Hadhr on the Tigris, the Atra of Ammianus Marcellinus.
Silver mirrors were introduced by Praxiteles, 328 B. C.
A famous mirror of antiquity was that placed by Ptolemy Euergetes (247 B. C.) on the summit of the Pharos of Alexandria.
The clearness with which distant objects were depicted caused observers to speak of it in exalted terms beyond any reasonable belief.
Abulfeda, the geographer, who wrote 1,000 years subsequently, states
hadows of the lunar mountains; on Jupiter, and discovered his satellites; on Saturn, and saw his bulging sides.
He supposed the planet to be triple, as his telescope was not of sufficient power to define the ring.
He afterward saw the phases of Venus and the spots on the sun. The reflecting telescope was invented in several forms, known as the Gregorian, Newtonian, etc. Then Newton made his discoveries in the reflection, refraction, inflections, and colors of light.
Achromatism was discovered bread-fruit and yams wrapped in plantain-leaves.
Captain Cook said it was the best mode of cooking he ever saw. It is a pity that he was afterward subjected to it. He was sent by the English government to the South Seas to observe a transit of Venus, and was killed and eaten by the natives of Owhyhee, February 14, 1779.
The early Egyptian oven was a crock sunk in the ground and heated by a fire built inside.
To the sides of the crock wet lumps of dough were attached and baked by the heat
, however, when the streets of Rome were first paved cannot be determined with certainty.
We are informed by Livy, that in the year of the city 584 (about 170 B. C.), the censors caused the streets to be paved from the ox-market to the temple of Venus.
The extravagant Heliogabalus caused the streets around the palace or on the Palatine Mount to be paved with foreign marble.
Streets paved with lava, having deep ruts worn by the wheels of carriages, and raised banks on each side for foot-pasulpture.Tithonotype.
An instrument made for the British government by Dallmeyer of England, for observing transits of Venus.
It consists of a telescope, mounted for photography, about eight feet in length, and having an object-glass of four inches in diameter and five feet focal length.
At the focus is placed an instantaneous shutter which serves to expose and immed
astwise trade, as no obsidian is found nearer than Mexico.
The saws of the South Sea islanders in 1768, when Captain Cook went to Otaheite to observe a transit of Venus, were made of sharks' teeth lashed to a back-piece.
The saws of the Lacustrians and other early inhabitants of Europe were of jagged flint; those of the Caribs, osumptuously furnished, and the floors paved with mosaics from the story of the Iliad.
On the upper deck were gardens with arbors of ivy and vines, and a temple of Venus paved with agates and roofed with cypress wood.
It was adorned with pictures and statues, and furnished with couches and drinking-vessels.
It had a library, bathuettes are frequently of metal.
The Roman Colossus set up by Nero, being a figure of himself, was placed before his Golden House, near the site of the temple of Venus, at Rome.
It was of bronze, the work of Zenodorus, and Pliny gives its hight as 110 feet, — larger than that of Rhodes.
About 1491 B. C., he [Aaron] received t
ing imperfectly seen, so that its true character was not at first recognized, — the solar spots, and the crescent form of Venus.
As early as November, 1610, Galileo wrote to Kepler that Saturn consists of three heavenly bodies in contact with eac
The cycle of admirable discoveries, which scarcely occupied two years, was completed by the observation of the phases of Venus.
As early as 1610, Galileo noticed the sickle or crescent form of the planet, and, according to a practice much in vogue telescopes which Galilco constructed himself, and others which he used for observing Jupiter's satellites, the phases of Venus, and the solar spots, magnified four, seven, and thirty-two times in linear dimensions, — never more.
The Arenarius ofnuary 7, 1610, he discovered three of the moons of Jupiter, and the fourth shortly after.
His discovery of the phases of Venus furnished another proof of the truth of the heliocentric theory.
The papal persecution which followed Bruno, who was bur