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Gravity anomaly
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===The tidal correction=== The Sun and Moon create time-dependent tidal forces that affect the measured value of gravity by about 0.3 mgal. Two-thirds of this is from the Moon. This effect is very well understood and can be calculated precisely for a given time and location using astrophysical data and formulas, to yield the tidal correction β³''g''<sub>tid</sub>.{{sfn|Lowrie|2007|p=54}}
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