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The length of a solar day is determined by the time that it takes for the Earth to complete a full rotation around its axis and equals 24 hours.
The Earth’s rotation on its axis leads to change between day and night.
The RHX method depends on the validity of this law for describing long-term RHX weight gain on archaeological timescales.
There is now strong support for power-law behaviour from analyses of long-term moisture expansion data in brick ceramic, some of which now extends over more than 60 y.
Time zone boundaries usually follow country or administrative borders.
This weight increase provides an accurate measure of the extent of rehydroxylation.
The dating clock is provided by the experimental finding that the RHX reaction follows a precise kinetic law: the weight gain increases as the fourth root of the time which has elapsed since firing.
According to the RHX power-law, if the weight of a fired-clay ceramic increases as a result of RHX by 0.1% in 1 yr from firing, then the weight increase is 0.2% in 16 yr, 0.3% in 81 yr and 0.4% in 256 yr (and so on).
Another consequence of this rotation is the fact that while moving by 15° from West to East local solar time increases by an hour.
In everyday life people use official local time which almost always differs from solar time.