scholarly journals CAṄKA ILAKKIYATTIL VĀṈIYAL [ASTRONOMY IN SANGAM LITERATURE]

2022 ◽  
pp. 82-87
Author(s):  
K. PUSPHA
Keyword(s):  
Time Scales ◽  
Basic Science ◽  
Scientific Method ◽  
World Literature ◽  
The Sun ◽  
Polar Fish

Tamil science is the knowledge that has traditionally been developed, used and explained scientifically by Tamils. It also refers to the contribution that Tamil is making to science today. Tamil science is found in many fields such as linguistics, medicine, architecture, agriculture, biology, mathematics and astronomy. It is noteworthy that the Tamils ​​who had various technologies also had the basic science for it. Sangam literature is interspersed with versatile messages. Admired as world literature, it contains news from a variety of disciplines. It is known that the Sangam periodicals became versatile due to this. Many world scholars have studied and praised the astronomical news found by the Tamils. Tamils ​​refer to those who know astronomy as 'virgins'. Literary evidence also suggests that the computer predicts time with the motions of a planet orbiting in the sky. The literature is a testament to the fact that Tamils ​​are the ones who know the scientific method of measuring the planets and atmospheres of the sky, their movements and time scales. The Sangam poets knew that there were various planets and galaxies in the sky. News about the Sun, Earth, Jupiter, Mercury, Venus, Saturn, and the satellite Moon is found in the association songs. News about dental galaxies has also been reported in Sangam literature. It is also possible to know that the Tamils ​​who guided the polar fish at night knew the four directions during the day with the help of the sun.

scholarly journals New insights into the stratospheric and mesosphere-lower thermospheric ozone response to the abrupt changes in solar forcing

2011 ◽  
Vol 29 (6) ◽  
pp. 1093-1099 ◽  
Author(s):  
◽  
K. V. Subrahmanyam ◽  
Keyword(s):  
Vertical Distribution ◽  
Time Scales ◽  
Solar Eclipse ◽  
Stratospheric Ozone ◽  
The Sun ◽  
Solar Forcing ◽  
Abrupt Changes ◽  
First Time ◽  
The Vertical Distribution ◽  
Annular Solar Eclipse

Abstract. Using a unique set of satellite based observations of the vertical distribution of ozone during the recent annular solar eclipse of 15 January 2010, we demonstrate for the first time, a complete picture of the response of stratospheric ozone to abrupt changes in solar forcing. The stratospheric ozone decreased after the maximum obscuration of the Sun and then gradually increased with time. A dramatic increase in stratospheric ozone of up to 4 ppmv is observed 3 h after the maximum obscuration of the Sun. The present study also reports for the first time the mesosphere-lower thermospheric ozone response to solar eclipse. Thus it is envisaged that the present results will have important implications in understanding the ozone response to abrupt changes in solar forcing and time-scales involved in such response.

scholarly journals قاعدة الأصل بقاء ما كان على ما كان وتطبيقها في الصائم الذي أفطر قبل غروب الشمس خطأً: دراسة مقارنة بين المذاهب الأربعة وشيخ الإسلام ابن تيمية

2021 ◽  
Vol 2 (2) ◽  
pp. 262-282
Author(s):  
Syandri Syandri ◽  
Muhammad Ikhsan ◽  
Abi Hendri
Keyword(s):  
Scientific Method ◽  
The Sun ◽  
The People ◽  
The Law

This research discusses the law of the people who break the fast assuming the sun has set, then proved afterwards that the sun has not set by comparing the four schools and Shaykh al-Islām Ibn Taymiyyah, as well as how the implementation of the rule al-Aṣl Baqā' mā Kān 'alā mā Kān. This research aims to find out how the law of fasting according to the four schools, Shaykh Islam Ibn Taymiyyah in this matter, and how the above rules are implemented in this matter. The scientific method used in this study is inductive and deductive methods. The results showed that the law of fasting according to jumhūr al-ulamā’ for people who break the fast assuming the sun has set, then it is clear afterwards that the sun has not set is the unvalid fast, and he is obliged to replace (qaḍā’) it based on the proposition in their view. Jumhūr put this issue in the rule of al-aṣl baqā' mā kān 'alā mā kān. In contrast to Shaykh al-Islām Ibn Taimiyah who considers that his fasting is valid and unnecessary based on the proposition on which he handles it, and he does not include this problem in the rule of al-aṣl baqā' mā kān 'alā mā kān.

VI. The Sun as a Star

1988 ◽  
Vol 20 (1) ◽  
pp. 102-106
Author(s):  
L.E. Cram
Keyword(s):  
Time Scales ◽  
Spatial Extent ◽  
The Sun ◽  
Distinguishing Characteristic ◽  
X Ray ◽  
Spatially Resolved ◽  
Solar Observations ◽  
The Earth ◽  
The Subject

Studies of the global (spatially unresolved) output from the sun are important for two main reasons: (1) the global solar output directed towards the earth plays a central role in solar-terrestrial relations, and (2) global solar observations form a link between (neccessarily) global observations of stars and the more refined spatially resolved observations which are available for the sun. This report covers both aspects (insofar as they concern the sun), using the time-scales of various phenomena as a basic distinguishing characteristic. Note that certain studies of spatially unresolved solar output have not been discussed, since they are actually directed toward the investigation of phenomena of strictly limited spatial extent [e.g. radiospectrograph observations (e.g. Wiehl et al. 1985) and studies of X-ray bursts (e.g. Thomas et al. 1985)]. Collections of relevant papers may be found in De Jager and Svestka (1985) and Labonte et al. (1984), while a review of germane stellar work is available in Baliunas and Vaughan (1985) and solar-terrestrial work in Donnelly and Heath (1985). A comprehensive summary of the subject by Hudson will appear soon in Review of Geophysics and Planetary Physics.

On long-duration 3D simulations of stellar convection using ANTARES

2018 ◽  
Vol 14 (A30) ◽  
pp. 373-376
Author(s):  
F. Kupka ◽  
D. ◽  
Fabbian ◽  
D. ◽  
Krüger ◽  
...  
Keyword(s):  
Time Scales ◽  
Three Dimensional ◽  
The Sun ◽  
3D Simulations ◽  
Stellar Convection ◽  
Long Duration ◽  
Computational Data ◽  
Mode Excitation ◽  
Hydrodynamical Simulations ◽  
Initial Results

AbstractWe present initial results from three-dimensional (3-D) radiation hydrodynamical simulations for the Sun and targeted Sun-like stars. We plan to extend these simulations up to several stellar days to study p-mode excitation and damping processes. The level of variation of irradiance on the time scales spanned by our 3-D simulations will be studied too. Here we show results from a first analysis of the computational data we produced so far.

Was Galileo Right and the Catholic Church Wrong?

2021 ◽  
pp. 36-49
Author(s):  
Steven L. Goldman
Keyword(s):  
Catholic Church ◽  
Scientific Method ◽  
Deductive Reasoning ◽  
Modern Science ◽  
The Sun ◽  
Natural Phenomena ◽  
The Earth ◽  
The Way ◽  
The Catholic Church

Galileo is an iconic founder of modern science, but his career and his contributions were far more complex than his reputation. He, too, championed a scientific method, but his thinking differed greatly from Bacon’s and Descartes’. Galileo’s method was based on Archimedes’ combination of experiment, mathematics, and deduction. This method allowed Galileo to claim certain knowledge of reality derived from mathematical accounts of natural phenomena. But he also claimed certain knowledge of reality derived directly from observation, as in his assertion that the Earth moved around the sun. While Galileo’s predictions were sometimes correct, he had no criterion for distinguishing between correct and incorrect inferences or for connecting his mathematical deductive reasoning about phenomena to the way they really were.

Numbers and Shapes

2020 ◽  
pp. 36-53
Author(s):  
Demetris Nicolaides
Keyword(s):  
Mathematical Analysis ◽  
Scientific Method ◽  
Wave Functions ◽  
Quantum Mechanical ◽  
The Sun ◽  
Mechanical Wave ◽  
The Earth ◽  
Copernican Revolution ◽  
Modern Physics ◽  
Theory Of Forms

Pythagoras initiated the mathematical analysis of nature, a cornerstone practice in modern physics. “Things are numbers” is the most significant Pythagorean doctrine. It signifies that the phenomena of nature are describable by equations and numbers. Therefore, nature is quantifiable and potentially knowable through the scientific method. The Pythagoreans quantified pleasing sounds of music, right-angled triangles, even the motion of the heavenly bodies. The “Copernican revolution” (heliocentricity) is traced back to Pythagorean cosmology. But, finally, Einstein’s relativity clarifies a popular misconception related to it: that “the earth revolves around the sun (heliocentricity) is correct,” and that “the sun revolves around the earth (geocentricism) is incorrect.” Plato was inspired by Pythagorean mathematics, but he replaced “things are numbers” with things are shapes, forms, Forms, a noetic description of nature known as the theory of “Forms.” The quantum-mechanical wave-functions—mathematical forms that describe microscopic particles—are the Platonic Forms of quarks and leptons.

Solar and Climate Changes

1997 ◽  
Author(s):  
Douglas V. Hoyt ◽  
Kenneth H. Shatten
Keyword(s):  
Solar Activity ◽  
Time Scales ◽  
Solar Rotation ◽  
Sunspot Cycle ◽  
Climatic Changes ◽  
Decay Rates ◽  
Spectral Irradiance ◽  
The Sun ◽  
Total Irradiance ◽  
Earth’S Climate

Until now we have considered only 11-year variations in solar activity and climate. The sun also varies on longer time scales. Since these variations seem to parallel a number of climatic changes, the sun may contribute to climatic changes on time scales of decades to centuries. We now examine several solar indices that vary in parallel with Earth’s climate change. There exist plausible arguments that these indices are proxy indicators of the sun’s radiative output, but there is no proof. We now present the strongest correlations we have seen for a sun/climate connection. First, as it is the most widely publicized index, we consider the mean level of solar activity. In 1801 Herschel first proposed a relationship between climate and the level of solar activity. Second, we examine solar cycle lengths, which have been studied sporadically since 1905. Third, we look at two closely related indices—sunspot structure and sunspot decay rates. Fourth, we consider variations in the solar rotation rate. Lastly, we examine some major solar and climatic events of the last thousand years to see if any indications of solar influence are evident on climate. Although we present the solar-induced changes as arising from total-irradiance variations, as discussed earlier spectral-irradiance changes may be the primary driver. When Rudolf Wolf reconstructed solar activity based on historical observations of sunspots, he found an 11-year cycle going back to at least 1700. In 1853 Wolf also claimed that there is an 83-year sunspot cycle. This longer term variation becomes evident simply by smoothing the data, as in Socher’s 1939 example. Wolf’s original discovery of an 83-year cycle was forgotten, but the long cycle was rediscovered by H. H. Turner, W. Schmidt, H. H. Clayton, and probably others. After W. Gleissberg also discovered this 80- to 90-year cycle around 1938, he published so much material on the subject that ever since it has been called the Gleissberg cycle. All these rediscoveries of the same phenomenon indicate that the 80- to 90-year cycle may be real but not strictly periodic. Rather, the cycle may be a “persistency” with an 80- to 90-year period. During this period solar activity is quite powerful but fails to exhibit a single sharp spectral peak.

The Movement of Specificity

PMLA ◽  
2013 ◽  
Vol 128 (3) ◽  
pp. 668-674 ◽  
Author(s):  
Nirvana Tanoukhi
Keyword(s):  
World Literature ◽  
American Fiction ◽  
Chinua Achebe ◽  
The Sun ◽  
Camara Laye ◽  
Things Fall Apart ◽  
Young Writer ◽  
Kinky Hair

If you want to know about Africa, read our literature—and not just Things Fall Apart.—Chris AbaniChimamandaadichie summarizes the current dilemma of the peripheral writer in thetitle of her recent ted talk: “The danger of a Single Story.” The talk's masterly braiding of ethos, pathos, and humor epitomizes the winning formula of this distinctively metropolitan media genre. But Adichie's rhetorical ingenuity interests us not as a cultural spectacle—the scene of a young African writer's anointment by metropolitan brokers as an upcoming “world writer”—but for what it structurally illuminates about the kind of minoritarian literary consciousness that gave birth to the concept of world literature. The speech begins by taking the audience down a well-trodden path, the story of Adichie's beginnings as a young writer in Nigeria—specifically, the naïveté of her childhood compositions: “All my characters were white and blue-eyed, they played in the snow, they ate apples, and they talked a lot about the weather, how lovely it was that the sun had come out.” How deluded and childish it now seemed to Adichie, this business of putting cloudy skies and sumptuous apples in an African story. Luckily, African novelists like Chinua Achebe and Camara Laye already existed to dispel her original disorientation, so that she learned to replace the landscapes of British and American fiction with familiar settings where “people like me, girls with skin the color of chocolate, whose kinky hair could not form ponytails, could also exist in literature.”

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