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XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

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1913/14 First gravimetric proof of the solid Earth tides M2 by SCHWEYDAR<br />

with measurements in a Freiberg silver mine, 189 m below surface, as<br />

earlier arranged by O. HECKER.<br />

1933/34 First German quarz clocks developed at the Physical-Technical Agency<br />

of the German Reich in Berlin and calibrated/drift-controlled by geodeticastronomic<br />

messurements at the GIP and since regularly used by the GIP.<br />

• Discovery of variations in the Earth´s rotation velocity<br />

• Potsdam time service → steering GDR radio time signals until 1975<br />

Peter Bormann <strong>XXIX</strong> <strong>ESC</strong> <strong>General</strong> <strong>Assembly</strong>, <strong>Sept</strong>. <strong>12</strong>-<strong>17</strong>, <strong>2004</strong>

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