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Wednesday 8 October 2014

Scientist of the Day

Sir Arthur Eddington
Sir Arthur Eddington was an eminent English astronomer, physicist and mathematician. He is noted for his grounbreaking research work in astrophysics. Being the first person to investigate the motion, internal structure and evolution of stars, Eddington is widely considered to be one of the greatest astronomers of all time.
Born on December 28, 1882 in Kendal, Cumbria, Arthur Eddington’s father was the head of a local school. Eddington was a bright student and he won an entrance scholarship to Trinity College, Cambridge. After graduating three years later, he accepted a teaching position, and after a few months, Eddington became the Chief Assistant at the Royal Observatory, Greenwich.
Eddington visited Malta in 1909 to find out the longitude of the geodetic station of the place. He also visited Brazil as the head of the eclipse expedition. He became the Plumian Professor of Astronomy in Cambridge in 1913, where he taught for about 31 years.
He published his first book, “Stellar Movements and the structure of the Universe”, in 1914. It laid the groundwork for scientific exposition. “The Internal Construction of the Stars”, another work by Eddington was published in 1926, which still remains one of the best-selling books about astronomy. His “Mathematical Theory of Relativity” was the earliest work in English language that explained the mathematical details of Einstein’s theory of gravitation.
Eddington discovered in 1926 that the inward gravitational pressure of a star must maintain the outward radiation and gas pressure to remain in equilibrium. He also demonstrated that there was an upper limit on the mass of a star. Eddington discovered mass-luminosity relationship, which implies that the the size of a star is directly proportional to its luminosity, making the mass of a star to be decided upon its intrinsic brightness.
In “Fundamental Theory”, which was published after his death, Eddington introduced his calculations of many of the constant of nature, particularly the recession velocity constant of the external galaxies, the ratio of the gravitational force to the electrical force between a proton and an electron, and the number of particles in the universe.
Arthur Eddington became a fellow of the Royal Astronomical Society in 1906, and eight years later, an elected Fellow of the Royal Society in 1914. He was knighted in 1938.
Eddington died in Cambridge, England on November 22, 1944 after an unsuccessful surgical operation. Eddington Memorial Scholarship and Eddington Medal were established after his death, in his honor.



Indian Airforce Day

The Indian Air Force (IAF; Devanāgarī: भारतीय वायु सेना, Bharatiya Vāyu Senā) is the air arm of the Indian armed forces. Its primary responsibility is to secure Indian airspace and to conduct aerial warfare during a conflict. It was officially established on 8 October 1932 as an auxiliary air force of the British Empire and the prefix Royal was added in 1945 in recognition of its services during World War II. After India achieved independence from the United Kingdom in 1947, the Royal Indian Air Force served the Dominion of India, with the prefix being dropped when India became a republic in 1950. Since independence, the IAF has been involved in four wars with neighbouring Pakistan and one with the People's Republic of China. Other major operations undertaken by the IAF include Operation Vijay – the annexation of Goa, Operation Meghdoot, Operation Cactus and Operation Poomalai. Apart from conflicts, the IAF has been an active participant in United Nations peacekeeping missions.
The President of India Pranab Mukherjee serves as the ex-officio Commander-in-Chief of the IAF. The Chief of Air Staff, an Air Chief Marshal (ACM), is a four-star commander and commands the Air Force. There is never more than one serving ACM at any given time in the IAF. The rank of Marshal of the Air Force has been conferred once, to Arjan Singh, by the president of India on 26 Jan 2002 and he became first five-star rank holding officer of IAF & serves as the ceremonial chief.
In its publication the Military Balance 2010, the International Institute for Strategic Studies (IISS) estimates that the Indian Air Force has a strength of 175,000 active personnel. However, various reliable sources provided notably divergent estimates of its strength over the years. Flightglobal estimates there to be to 1,499 aircraft in active service during 2013/2014
 
The IAF's mission is defined by the Armed Forces Act of 1947, Constitution of India and the Air Force Act of 1950, in the aerial battlespace, as:
Thus, the IAF has the primary objective of safeguarding Indian territory and national interests from all threats in conjunction with the other branches of the armed forces by defending Indian airspace. The IAF provides close air support to the Indian Army troops in the battlefield and also provides strategic and tactical airlift capabilities. The IAF also operates the Integrated Space Cell together with the other two branches of the Indian Armed Forces, the civilian Department of Space and the Indian Space Research Organization (ISRO) to utilise more effectively the country's space-based assets for military purposes and to look into threats to these assets.
The Indian Air Force along with the other branches of the Indian Armed Forces provide assistance in disaster relief such as during natural calamities by undertaking evacuation or search-and-rescue (SAR) operations and air dropping relief supplies in affected areas. The IAF provided extensive assistance to relief operations during natural calamities such as the Gujarat cyclone in 1998, the Tsunami in 2004 and North India floods in 2013. The IAF also provides assistance to other countries during relief activities such as Operation Rainbow in Sri Lanka.