A Brief History of Clocks: From Thales to Ptolemy
The clock is one of the most influential discoveries in the history of western science. The division of time into regular, predictable units is fundamental to the operation of society. Even in ancient times, humanity recognized the necessity of an orderly system of chronology. Hesiod, writing in the 8th century BC., used celestial bodies to indicate agricultural cycles: "When the Pleiads, Atlas' daughters, start to rise begin your harvest; plough when they go down" ( Hesiod 71). Later Greek scientists, such as Archimedes, developed complicated models of the heavens-celestial spheres-that illustrated the "wandering" of the sun, the moon, and the planets against the fixed position of the stars. Shortly after Archimedes, Ctesibus created the Clepsydra in the 2nd century BC. A more elaborate version of the common water clock, the Clepsydra was quite popular in ancient Greece. However, the development of stereography by Hipparchos in 150 BC. radically altered physical representations of the heavens. By integrating stereography with the Clepsydra and the celestial sphere, humanity was capable of creating more practical and accurate devices for measuring time-the anaphoric clock and the astrolabe. Although Ptolemy was familiar with both the anaphoric clock and the astrolabe, I believe that the development of the anaphoric clock preceded the development of the astrolabe.
The earliest example, in western culture, of a celestial sphere is attributed to the presocratic philosopher Thales. Unfortunately, little is known about Thales' sphere beyond Cicero's description in the De re publica:
For Gallus told us that the other kind of celestial globe, which was solid and contained no hollow space, was a very early invention, the first one of that kind having been constructed by Thales of Mileus, and later marked by Eudoxus with the constellations and stars which are fixed in the sky. (Price 56)
This description is helpful for understanding the basic form of Thales' sphere, and for pinpointing its creation at a specific point in time. However, it is clearly a simplification of events that occurred several hundred years before Cicero's lifetime. Why would Thales' create a spherical representation of the heavens and neglect to indicate the stars? Of what use is a bowling ball for locating celestial bodies? Considering Eudoxus' preoccupation with systems of concentric spheres, a more logical explanation is that Thales marked his sphere with stars, and Eudoxus later traced the ecliptic and the paths of the planets on the exterior.
In his book, Repcheck recounts how a Catholic Church cleric invented a highly complicated theory of the heavens’ architecture. Copernicus made a breakthrough by solving a significant astronomical problem. Everybody except the astronomers had earlier accepted Aristotle’s concept that heavenly objects revolved around the earth in perfectly circular orbits. The astronomers were opposed to this notion since their calculations could not work according to it. Repcheck introduces Ptolemy who described a cosmos in which the earth positioned itself somewhat off-center and other heavenly bodies revolved in one circular orbit inside a second ideal circle at changeable speeds. Even though Ptolemy’s model was rather complicated, astronomers found it to be reasonable in their calculations. Astronomers were still using this new concept even 1500 years later. In this regard, the author starts to bring Copernicus into the picture.
Have you ever wondered why when you stub your toe on the chair in the living room, it helps tremendously to yell out an expletive or two and vigorously rub the area? I may not be able to discuss the basis for such language in this paper, but we will explore the analgesic response to rubbing that toe, in addition to the mechanism of pain and alternative treatments such as acupuncture and transcutaneous electrical nerve stimulation.
for the breaking down of the power of astrology. The fact that the Earth rotates in
rapid development of polymer chemistry after World War II a host of new synthetic fibers
Network, C. W. (2008, May). About Concurrent Disorders. Retrieved from Central West Concurrent Disorders Network: hppt://centralwestcdn.ca/about-concurrent-disorders
Ptolemy also based on ancient astronomy significantly which the Earth sphericty recognized to him. The sphericty of the earth contain Saint Bede the Venerable in his account of the time, and wrote about 723 AD and this belief was reflected by the Christian writers.
Thayer seeks to understand Evolutionary theory as the ultimate cause of realism. In Evolutionary theory, humans like other animals have to evolve to survive and reproduce from natural selection, which develops two basic human traits: egoism and dominance (Thayer, 2000, p.130). In order to survive and for fitness, an organism tends to places its security over the others and according to Evoluti...
Pain is possibly the most unpleasant sensations our senses can detect. Even though we typically fail to remember what pain feels like when we are not experiencing it, we certainly do not wish to experience pain. Despite pain's unpleasantness, it has to be appreciated for what it is. Namely, a mechanism that allows us to avoid dangerous situations, to prevent further damage, and to promote the healing process. Pain allows us to remove ourselves form dangerous situations, as we attempt to move away from noxious stimuli that cause pain. As we attempt to escape stimuli that cause pain after an initial insult on our body, pain can prevent further damage form occurring. Finally, pain promotes the healing process as we take great care to protect an injured body part form further damage as to minimize the experience of more pain. How is this unpleasant, yet helpful sensation detected?
Pain, which is defined in its widest sense as an emotion which is the opposite of pleasure (White, 2004, p.455), is one of the major symptoms of cancer, affecting a majority of sufferers at some point during their condition (De Conno & Caraceni, 1996, p.8). The World Health Organization (WHO, 2009, online) suggests that relief from pain may be achieved in more than 90 percent of patients; however, Fitzgibbon and Loeser (2010, p.190) stress that pain may often be undertreated, even in the UK. Foley and Abernathy (2008, p.2759) identify numerous barriers to effective pain management, among which are professional barriers such as inadequate knowledge of pain mechanisms, assessment and management strategies.
While pain has always been present in humans' lives, Loeser and Melzack (1999) report that it is in only the past 30 years that pain research has made advances in both the treatment and the understanding of pain. There are three basic categories of pain: transient, acute, and chronic.
Historians and archeologists have found physical evidence that ancient civilizations had an active interest it the apparent motion of the celestial objects. Stonehenge in England, The Bighorn Medicine Wheel in the Unit...
German Chemist Hans von Pechmann first synthesized Polyethylene by accident in 1898 by heating diazomethane. His colleagues characterized the waxy substance polyethylene due to the fact that they recognized that it consisted of long ethene chains. It was then first industrially synthesized by accident in 1933 by applying extremely high pressure to ethylene and benzaldehyde. Over the years, development of polyethylene has increased due to the additions of catalyst. This makes ethylene polymerization possible at lower temperatures and pressures.1
·Aspirin (salicylic acid acetate) is an anti-inflammatory (decreases swelling and inflammation), anti-pyretic (fever reducing), and anti-platelet (decreases platelets in the body to thin blood). Many heart treatment patients take an aspirin a day to prevent blood clotting. However, if aspirin is taken in large quantities over long periods of time, it may cause gastric ulcers or other internal damage. The molecular formula of aspirin is C9H8O4. Some examples of Aspirin are Bayer, Ecotrin, and Aspergum.
Barthes, Roland, 2006: “Operation Margarine” from “Media and Cultural Studies” (collected by Meenakshi Gigi Durham and Douglas Kellner)
Astronomy is a very important field in science. Ancient Greece, China, and India all contributed to our everyday ideas and uses of astronomy. Ancient Greece was the most influential because the Indian’s based most of their astronomy off of Greece. The Greeks created calendars that were based off of the eclipse cycle, which they called by two different names, Hellenic Calendars and Lunisolar Calendars. Because of Ancient Greece, we now have calendars to keep us on track every day. The Greeks observed a celestial object passing through the eastern and western morning sky. After a long time of observations, they came to a realization that it was a planet and now that is the planet is well known as Venus. (Sarton, 75) Plato and Aristotle’s theories were incredible contributions on us today. Both of their theories were all about the behavior and life of the planets, such as their theory that the earth is spherical. (Sarton, 421). Ancient Greece als...