Options for adjusting India standard time for saving energy

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NIAS Report , National Institute of Advanced Studies, Bangalore, Number 978-81-87663-51-5, Bangalore (2011)




For millenia, in any given place on earth noon was when the sun was highest in the sky. Up until the middle ages time was essentially a local phenomenon; shadows of obelisks and later sundials tracked the passage of time. Both travel and communications were slow. With increasing accuracy of mechanical clocks, a need arose to equalize the length of the eccentricity of the earth's orbit and the tilt of its axis (Prerau, 2005, p.30). Thus Geneva became the first city to introduce the first adjustment to local time by adopting mean solar time in 1780. As east-west travel by railways and communication by telegraph become more prevalent, the use of single mean time over a large region was the second adjustment to natural sun time starting in Britain in 1840. At first it was called railroad time, later it came to be called standard time. At the International Prime Meridian Conference held in Washington in 1884, the system of International standard time according to established time zones was adopted. this system is still in use today.


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