Sentences with phrase «drift over time spans»

But clock precision tends to drift over time spans beyond a few hours because the atoms are dispersed in high - pressure gases, which alter the atoms» resonant frequency — the clock tick rate — depending on temperature.

Not exact matches

We updated version A after discovering that the eastward drift of NOAA - 11 over its 6 - yr life span caused a spurious warming effect to develop due, as we believed, to the fact the satellite was sampling the earth at later times during the local diurnal cycle (version B, Christy et al. 1995).»