X. Astronomical observations on the rotation of the planets round their axes, made with a view to determine whether the Earth's diurnal motion is perfectly equable. In a letter from Mr. William Herschel of Bath to William Watson, M. D. F. R. S

1781 ◽  
Vol 71 ◽  
pp. 115-138 ◽  

Sir, The various motions of the planet we inhabit; the an­nual revolution in its orbit; the diurnal rotation round its axis; the menstrual motion round the common center of gravity of the moon and earth;

1665 ◽  
Vol 1 (16) ◽  
pp. 263-281 ◽  

How abstruse a subject in philosophy, the flux and reflux of the sea hath proved hitherto, and how much the same hath in all ages perplexed the minds even of the best of naturalists, when they have attempted to render an account of the cause thereof, is needless here to represent.


2009 ◽  
Vol 8 (4) ◽  
pp. 162-164
Author(s):  
Yu. P. Bredikhina ◽  
F. I. Gouzhov ◽  
L. V. Kapilevich ◽  
V. I. Andreyev

The methods of electrmiography and stabilography are used to determine biomechanic characteristics of target-oriented kick motions in sportive karate. It is shown that highly qualified sportsmen can better maintain equilibrium in main karate combat maneuvers. This shows itself in the smaller amplitude of vibrations of the common center of gravity and in higher quality values of the equilibrium function compared to lower-qualification sportsmen. In addition, masters of sports show the synchronous operation of motor units, their simultaneous participation in a kick motion. The dynamics of main stabilogram and electromiogram characteristics can be used as an indicator of the level of technical training of sportsmen.


1768 ◽  
Vol 58 ◽  
pp. 156-169 ◽  

It is demonstrated by Sir Isaac Newton in the Principia , that it is not the Earth's center, but the common center of gravity of the Earth and Moon, that describes the ecliptic; and that the Earth and Moon revolve in similar ellipses, about their common center of gravity.


In this paper the author investigates the periodical variations of the winds, rain and temperature, corresponding to the conditions of the moon’s declination, in a manner similar to that he has already followed in the case of the barometrical variations, on a period of years extending from 1815 to 1832 inclusive. In each case he gives tables of the average quantities for each week, at the middle of which the moon is in the equator, or else has either attained its maximum north or south declination. He thus finds that a north-east wind is most promoted by the constant solar influence which causes it, when the moon is about the equator, going from north to south; that a south-east wind, in like manner, prevails most when the moon is proceeding to acquire a southern declination ; that winds from the south and west blow more when the moon is in her mean degrees of declination, going either way, than with a full north or south declination ; and that a north-west wind, the common summer and fair weather wind of the climate, affects, in like manner, the mean declination, in either direction, in preference to the north or south, and most when the moon is coming north. He finds the average annual depth of rain, falling in the neighbourhood of London, is 25’17 inches.


2006 ◽  
Author(s):  
William Shust ◽  
Nicholas Wilson ◽  
Stan Gurule

Heavy-duty railcars carry greater than typical payloads by employing additional wheelsets to lessen wheel/rail contact stresses. Rather than the common 4-axle designs, these cars may have up to 16 axles supporting one deck. Traditionally, these car types have not performed as well as desired. As a response, designers have created depressed center body styles to lower the overall center-of-gravity (CG) height. Such designs lead to more complexity and expense. In this investigation, a heavy-duty 8-axle flatcar has been modeled, both with a flat carbody and a depressed body style. Simulations of harmonic roll perturbations were performed using various CG heights, track perturbation wavelengths and operating speeds. Results include comparisons of design versus performance trade-offs.


Astrophysics ◽  
1984 ◽  
Vol 21 (2) ◽  
pp. 503-507
Author(s):  
M. I. Agafonov ◽  
A. M. Aslanyan ◽  
A. P. Barabanov ◽  
I. T. Bubukin ◽  
A. G. Gulyan ◽  
...  

1998 ◽  
Vol 11 (2) ◽  
pp. 990-991
Author(s):  
Peter C. Chen ◽  
Yoji Kondo ◽  
Ronald J. Oliversen

The Moon combines some of the most attractive features for astronomical observations from space (no atmospheric absorption, perfect seeing, etc.) and those from ground (large steady optical bench, ease of control from Earth, etc.). Astronomers have planned for telescopes on the Moon for decades but, due to its primary obstacle – high cost – they have not yet been built, save one small telescope that was carried to the Moon on an Apollo mission.


2011 ◽  
Vol 4 (2) ◽  
pp. 172-227 ◽  
Author(s):  
Peter J. Huber

Abstract Egyptian dates are widely used for fixing the chronologies of surrounding countries in the Ancient Near East. But the astronomical basis of Egyptian chronology is shakier than generally assumed. The moon dates of the Middle and New Kingdom are here re-examined with the help of experiences gained from Babylonian astronomical observations. The astronomical basis of the chronology of the New Kingdom is at best ambiguous. The conventional date of Thutmose III’s year 1 in 1479 BC agrees with the raw moon dates, but it has been argued by several Egyptologists that those dates should be amended by one day, and then the unique match is 1504 BC. The widely accepted identification of a moon date in year 52 of Ramesses II, which leads to an accession of Ramesses II in 1279 BC, is by no means certain. In my opinion that accession year remains nothing more than one of several possibilities. If one opts for a shortened Horemhab reign, dating Ramesses II to 1290 BC gives a better compromise chronology. But the most convincing astronomical chronology is a long one: Ramesses II in 1315 BC, Thutmose III in 1504 BC. It is favored by Amarna-Hittite synchronisms and a solar eclipse in the time of Muršili II. The main counter-argument is that this chronology is at least 10–15 years higher than what one calculates from the Assyrian King List and the Kassite synchronisms. For the Middle Kingdom on the other hand, among the disputed dates of Sesostris III and Amenemhet III one combination turns out to be reasonably secure: Sesostris III’s year 1 in 1873/72 BC and Amenemhet III’s 30 years later.


1785 ◽  
Vol 75 ◽  
pp. 137-152

Sir, I send you the account of the observations on the eclipse of the moon, which I have made together with the rev. Father Le Fevre, Astronomer at Lyons, in the Observatory called au grand Collège ; to which I shall add the observations of the vernal equinox; some observation son Jupiter's satellites, made at Marseilles by M. Saint Jacques de Sylvabelle; and, lastly, a new solution of a problem that occurs in computing the orbits of comets. If you think that these observations do in any way deserve the notice of the Royal Society, I ascertain the going of the pendulum clock, I took several corresponding altitudes of the sun, which you will find in the following table.On the day of the eclipse the sky was very serene, nothing could be finer, and it continued so during the observation.


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