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Scientists to Map Out Earth's Soil--New tool will help explain and solve world’s greatest environmental threats（图）
Earth's Soil world’s greatest environmental threats
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2009/12/10
New York, February 17, 2009 — Some of the answers to the world’s greatest challenges -- such as climate change, food security, and water scarcity -- lie right beneath our feet. Responding to these and...
Why the 18.6 year tide cannot explain the change of sign observed in j2
secular variation of J2 18.6 year tide mean orbital motione
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2010/1/22
Recent studies show a change, starting in 1998, in the behavior of the variation of the dynamical flattening of the Earth (J2), supposed to be constant (secular), and mainly due to the post glacial re...