scholarly journals Notes upon Some Astronomical Observations Made in Kordofan and Darfur

1879 ◽  
Vol 49 ◽  
pp. 392
Author(s):  
H. G. Prout ◽  
W. J. Turner
Keyword(s):  
Astronomical Observations ◽  
Made In

scholarly journals The Amateur and Eclipsing Binary Stars

1988 ◽  
Vol 98 ◽  
pp. 35-39 ◽  
Author(s):  
Frank Bradshaw Wood
Keyword(s):  
Binary Stars ◽  
Variable Stars ◽  
Eclipsing Binary ◽  
Astronomical Observations ◽  
Minimum Light ◽  
Eclipsing Binary Stars ◽  
Made In

Probably no other branch of science has benefited as much from the work of dedicated amateurs as has the science of Astronomy. While some amateurs have made many useful types of astronomical observations– comets, meteors, occultations, etc. – perhaps none has been as extensive and as useful as those made in the field of variable stars. There are not nearly enough professional astronomers to keep under proper observation the increasingly large number of known variables. While all kinds of them are well worth continuous study, this paper will call attention to the importance of eclipsing variables and in particular the systematic and continuing observation of their times of minimum light.

scholarly journals Observing the skies of Lisbon. Isaac de Sequeira Samuda, an estrangeirado in the Royal Society

2014 ◽  
Vol 68 (2) ◽  
pp. 135-149 ◽  
Author(s):  
Carla Costa Vieira
Keyword(s):  
Royal Society ◽  
Scientific Community ◽  
Modern Literature ◽  
Scientific Instruments ◽  
Astronomical Observations ◽  
New Ideas ◽  
Made In

Elected in 1723, Isaac de Sequeira Samuda (1681–1729) was the first Jewish Fellow of the Royal Society. He had arrived in London just a few years earlier, escaping from the Portuguese Inquisition. Despite his past, he had no difficulty in establishing links with his country's diplomatic representatives in London. A physician and adviser on scientific subjects, he became a conduit between the emerging world of Portuguese astronomy and the British scientific community. He reported to the Royal Society on astronomical observations made in the new observatories in Lisbon and helped with the acquisition of scientific instruments and books destined for Portugal. These activities were facets of Samuda's unusual career and the diverse though often converging associations that he established until his death. As the member of a network active in the diffusion of new ideas and in the modernization of Portuguese science, Samuda can be regarded as an estrangeirado , as this term has come to be used in the modern literature.

XVIII. Account of a lithological survey Schehallien, made in order to determine the specific gravity of the rocks which compose that mountain

1811 ◽  
Vol 101 ◽  
pp. 347-377 ◽  
Keyword(s):  
Specific Gravity ◽  
Plumb Line ◽  
Medium Density ◽  
Astronomical Observations ◽  
The Earth ◽  
Mathematical Sciences ◽  
Made In

The astronomical observations made on the mountain Schehallien, in 1774, were confessedly of great importance to science. They ascertained the power of mountains to produce a sensible disturbance in the direction of the plumb-line; of consequence, they proved the general diffusion of gravity through terrestrial substances, and afforded data for determining the medium density of the earth, compared with that of the bodies at its surface. The skill with which this very delicate experiment was conducted by Dr. Maskelyne, and the ingenuity with which the results were deduced by Dr. Hutton, were worthy of the objects in view, and of the reputation which these distinguished men have acquired in their respective departments of the mathematical sciences.

scholarly journals On the observations of stars made in some British stone circles. —Second note

1906 ◽  
Vol 77 (519) ◽  
pp. 465-472 ◽  
Keyword(s):  
Royal Society ◽  
Preliminary Note ◽  
Astronomical Observations ◽  
Ancient Monuments ◽  
Made In

In a preliminary note communicated to the Royal Society on March 15,1905, I stated that I was attempting to continue here the researches in temple orientation carried on by myself in Egypt in 1891, by Mr. Penrose in Greece in 1892, and by both of us at Stonehenge in 1901. I pointed out that from the observations I had made at the Hurlers and Stanton Drew, of which I gave an account, it seemed probable that the outstanding stones of our ancient monuments had been erected to assist astronomical observations.

Account of a lithological survey of Schehallien, made in order to determine the specific gravity of the rocks which compose that mountain

1832 ◽  
Vol 1 ◽  
pp. 409-411
Keyword(s):  
Specific Gravity ◽  
Plumb Line ◽  
Present Survey ◽  
Astronomical Observations ◽  
The Earth ◽  
Direct Experiment ◽  
The Mean ◽  
Made In

Notwithstanding the skill with which Dr. Maskelyne conducted the astronomical observations upon Schehallien, and the accuracy with which he may be presumed to have measured the deflection of his plumb-line from the perpendicular, whereby he discovered the actual attraction of that mountain; and although great ingenuity was manifested by Dr. Hutton in deducing from thence the mean density of the earth; there remained one source of uncertainty in their results, dependent on the specific gravity of the mountain, which they assumed to be 2·5, but were aware that this might not be so accurate as would be desirable in a standard to which the density of the earth is directly compared. It was for this purpose that Mr. Playfair, with the assistance of Lord Webb Seymour, undertook the present survey of Schehallien, ascertaining, as accurately as they were able, the direction and inclination of the strata of which the mountain consists, and collecting specimens of all the varieties of rock which they could discover, in order to determine the specific gravity of each by direct experiment, and thence to estimate the correction which it might be necessary to introduce into Dr. Hutton’s calculation.

scholarly journals XXX. A letter from J. A. Rizzi Zannoni, Member of the Academy of Sciences at Gottingen, and Geographer to his Sicilian Majesty, to the late Earl of Morton, Pr. R. S. containing several astronomical observations, made in several parts of the kingdom of Naples and Sicily; translated from the French, by Mathew Maty, M. D. Sec. R. S

1768 ◽  
Vol 58 ◽  
pp. 196-202
Keyword(s):  
Astronomical Observations ◽  
Topographical Map ◽  
Kingdom Of Naples ◽  
Academy Of Sciences ◽  
Made In

My Lord, I take the liberty to apply to your Lordship on a subject of great importance to geography. His Sicilian Majesty has lately ordered a topographical map of his dominions to be made; and all the materials, which are to serve for that work, have been collected together.

Detection of geomagnetic disturbances with ionospheric calibration solutions of LOFAR astronomical observations

2021 ◽  
Author(s):  
Katarzyna Budzińska ◽  
Maaijke Mevius ◽  
Marcin Grzesiak ◽  
Mariusz Pożoga ◽  
Barbara Matyjasiak ◽  
...  
Keyword(s):  
Low Frequency ◽  
Limiting Factors ◽  
Electromagnetic Signal ◽  
Frequency Range ◽  
Geomagnetic Disturbances ◽  
Low Frequencies ◽  
Astronomical Observations ◽  
The Earth ◽  
Wavelet Transform Analysis ◽  
Made In

<p>Perturbation of an electromagnetic signal due to its passing through the Earth’s ionosphere is one of the limiting factors in obtaining high quality astronomical observations at low frequencies. Since the establishment of the Low Frequency Array (LOFAR) radio interferometer, which is operating  in the frequency range between 10  and 240 MHz, effort has been made in order to properly remove this effect during the calibration routine.</p><p>In this study we use differential TEC solutions obtained from calibration of Epoch of Reionization project’s observations and investigate their sensitivity to weak geomagnetic disturbances with wavelet transform analysis. Comparison to the different geomagnetic indices allows us to study the possible origin of medium scale ionospheric structures that have been detected.</p>

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