noun
definition
An astronomical and navigational instrument for gauging the altitude of the Sun and stars.
Examples of astrolabe in a Sentence
These works are lost; but their titles, combined with expressions in the letters of Synesius, who consulted her about the construction of an astrolabe and a hydroscope, indicate that she devoted herself specially to astronomy and mathematics.
A circular plate ' made much like the backe parte of an Astrolabe ' with a pivoted alidade, the sights.
His treatises De mensura astrolabii and De utilitatibus astrolabii (to be found, on the authority of Salzburg MSS., in Pez, Thesaurus anecdotorum novissimus, iii.) being the first contributions of moment furnished by a European to this subject, Hermann was for a time considered the inventor of the astrolabe.
Nearly every one of the modern instruments used for the observations of physical astronomy is a part of the perfected astrolabe.
A collection of circles such as is the armillary sphere, if each circle were fitted with a view-tube, might be considered a complete astrolabe.
With the tables of the sun's declination then available, he could calculate his latitude by meridian altitudes of the sun taken with his astrolabe.
Amongst them may be mentioned a history of the dispute with Palamas; biographies of his uncle and early instructor John, metropolitan of Heraclea, and of the martyr Codratus of Antioch; funeral orations for Theodore Metochita, and the two emperors Andronicus; commentaries on the wanderings of Odysseus and on Synesius's treatise on dreams; tracts on orthography and on words of doubtful meaning; a philosophical dialogue called Florentius or Concerning Wisdom; astronomical treatises on the date of Easter and the preparation of the astrolabe; and an extensive correspondence.
Chaucer wrote a treatise on the astrolabe; Milton constantly refers to planetary influences; in Shakespeare's King Lear, Gloucester and Edmund represent respectively the old and the new faith.
For navigational purposes a more basic and sturdy version was needed, and this became known as the mariner's astrolabe.
The ticket counter is in a lobby, where there is a bust of Halley and some instruments, including a 1580 astrolabe.
Activities include making a simple astrolabe, calculating your moon weight and writing a letter to an alien.
Sharaf al-Din al-Tusi (born 1201) invented the linear astrolabe.
The mariner's astrolabe was superseded by John Hadley's quadrant of 1731.
He was the author also of a mathematical work on the use of the astrolabe and of a book (Muhit, " the ocean ") on the navigation of the Indian seas.
Communal dwellings on a much smaller scale occur at Meroka, east of the Astrolabe mountains.
He was taught the use of the astrolabe (which Prince Yakov Dolgoruki, with intent to please, had brought him from Paris) by a Dutchman, Franz Timmerman, who also instructed him in the rudiments of geometry and fortifications.
In Astrolabe i Bay the limit is 6; with the more degraded tribes it is 3, or, as in Torres straits, they have names only for 1 and 2; 3 is 2 +1.
Gradually, from Eratosthenes to Tycho, Hipparchus playing the most important part among ancient astronomers, the complex astrolabe was evolved, large specimens being among the chief observa tory instruments of the 15th, 16th and even 17th centuries; while small ones were in use among travellers and learned men, not only for astronomical, but for astrological and topographical purposes.
He wrote also treatises on the astrolabe (a copy of this is in the British Museum), on the abacus (three copies exist in the Vatican library, the library of Leiden University and the Bibliotheque Nationale in Paris), translations of the Kharismian Tables and an Arabic Introduction to Astronomy.
In 1827 Dumont d'Urville in the "Astrolabe" surveyed them much more accurately, but the first thorough survey was that of the United States exploring expedition in 1840.
The astrolabe quadrant or cross-staff enabled the mariner to determine"his latitude with a certain amount of accuracy, but for his longitude 1 See fig.
At Humboldt Bay the people are ready to trade, as are the tribes at Astrolabe Bay; here the Russian Miklucho Maclay lived for some time, and was favourably impressed by the natives.
The principle of the astrolabe is explained in fig.