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9) Republic Day 2021: Parade right time to security arrangements traffic limits to Delhi Metro providers - All you need to know

India Republic Day -- Republic Day 2021 Parade Routine Chief Guest Security Preparations: The parade normally sees thousands of people and foreign dignitaries invited to see the parade. Still the number of guests and they has been restricted due to the coronavirus pandemic this time. Republic Day 2021 Parade Timings Key Guest Delhi Metro Companies: India will celebrate it has the 72nd Republic Day with January 26. This day is definitely marked to celebrate the particular date on which the Constitution of India came into being in 1950. On this day the Republic Day parade takes place scaled-down the military might as well as the rich cultural heritage with the country. The parade usually sees thousands of people and foreign dignitaries invited to see the attend. However the number of guests along with attendees has been restricted because of the coronavirus pandemic this time. This current year there will be no chief invitees or foreign dignitaries with Republic Day. The number of rac
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History of science

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The history of science is the study of the development of science, including both the natural and social sciences (the history of the arts and humanities is termed history of scholarship). Science is a body of empirical, theoretical, and practical knowledge about the natural world, produced by scientists who emphasize the observation, explanation, and prediction of real-world phenomena. Historiography of science, in contrast, studies the methods employed by historians of science. The English word scientist is relatively recent, first coined by William Whewell in the 19th century. Before that, investigators of nature called themselves "natural philosophers". While observations of the natural world have been described since classical antiquity (for example, by Thales and Aristotle), and the scientific method has been employed since the Middle Ages (for example, by Ibn al-Haytham and Roger Bacon), modern science began to develop in the early modern period, and in particular i
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Early cultures

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In prehistoric times, knowledge and technique were passed from generation to generation in an oral tradition. For instance, the domestication of maize for agriculture has been dated to about 9,000 years ago in southern Mexico, before the development of writing systems. Similarly, archaeological evidence indicates the development of astronomical knowledge in preliterate societies. The development of writing enabled humans to store and communicate knowledge across generations with much greater accuracy. Many ancient civilizations systematically collected astronomical observations. Rather than speculating on the material nature of the planets and stars, the ancients charted the relative positions of celestial bodies, often inferring their influence on human individuals and humankind. This demonstrates how ancient investigators generally employed a holistic intuition, assuming the interconnectedness of all things, whereas modern science rejects such conceptual leaps. citation needed Basic
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Post-classical science

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In the Middle Ages the classical learning continued in three major linguistic cultures and civilizations: Greek (the Byzantine Empire), Arabic (the Islamic world), and Latin (Western Europe). Byzantine Empire edit Because of the collapse of the Western Roman Empire, the intellectual level in the western part of Europe declined in the 400s. In contrast, the Eastern Roman or Byzantine Empire resisted the barbarian attacks, and preserved and improved the learning. While the Byzantine Empire still held learning centers such as Constantinople, Alexandria and Antioch, Western Europe's knowledge was concentrated in monasteries until the development of medieval universities in the 12th centuries. The curriculum of monastic schools included the study of the few available ancient texts and of new works on practical subjects like medicine and timekeeping. In the sixth century in the Byzantine Empire, Isidore of Miletus compiled Archimedes' mathematical works in the Archimedes Palimpsest,
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Impact of science in Europe

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The renewal of learning in Europe began with 12th century Scholasticism. The Northern Renaissance showed a decisive shift in focus from Aristotelian natural philosophy to chemistry and the biological sciences (botany, anatomy, and medicine). Thus modern science in Europe was resumed in a period of great upheaval: the Protestant Reformation and Catholic Counter-Reformation; the discovery of the Americas by Christopher Columbus; the Fall of Constantinople; but also the re-discovery of Aristotle during the Scholastic period presaged large social and political changes. Thus, a suitable environment was created in which it became possible to question scientific doctrine, in much the same way that Martin Luther and John Calvin questioned religious doctrine. The works of Ptolemy (astronomy) and Galen (medicine) were found not always to match everyday observations. Work by Vesalius on human cadavers found problems with the Galenic view of anatomy. The willingness to question previously held tru
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Modern science

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With the scientific revolution, paradigms established in the time of classical antiquity were replaced with those of scientists like Nicolaus Copernicus, Galileo Galilei, Christiaan Huygens and Isaac Newton. During the 19th century, the practice of science became professionalized and institutionalized in ways that continued through the 20th century. As the role of scientific knowledge grew in society, it became incorporated with many aspects of the functioning of nation-states. Natural sciences edit Physics edit The scientific revolution is a convenient boundary between ancient thought and classical physics. Nicolaus Copernicus revived the heliocentric model of the solar system described by Aristarchus of Samos. This was followed by the first known model of planetary motion given by Johannes Kepler in the early 17th century, which proposed that the planets follow elliptical orbits, with the Sun at one focus of the ellipse. Galileo (" Father of Modern Physics ") also made use
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Academic study

As an academic field, history of science and technology began with the publication of William Whewell's History of the Inductive Sciences (first published in 1837). A more formal study of the history of science as an independent discipline was launched by George Sarton's publications, Introduction to the History of Science (1927) and the Isis journal (founded in 1912). Sarton exemplified the early 20th-century view of the history of science as the history of great men and great ideas. He shared with many of his contemporaries a Whiggish belief in history as a record of the advances and delays in the march of progress. The history of science was not a recognized subfield of American history in this period, and most of the work was carried out by interested scientists and physicians rather than professional historians. With the work of I. Bernard Cohen at Harvard, the history of science became an established subdiscipline of history after 1945. The history of mathematics, hi
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