Abstract
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In the first week of April 2011 The International Dark-Sky Association celebrated
International Dark Sky Week, an annual event raising awareness of how artificial
lighting is rapidly destroying the dark sky at night. In the same week, in post-tsunami
Japan, debate emerged about whether to introduce unusual daylight-savings regula-
tions and force companies to shift operating hours for workers to relieve the stress
on the country's crippled power plants.