But the rotation of the earth is an unreliable touchstone: churning magma in the planet's core, the growth and shrinkage of sea ice, and wind battering mountains all lead to microseconds of variation in the duration of its daily rotation.
This oscillation results from the annual variation in the angle at which the Sun's rays reach Earth's surface and from the annual variation in the duration of sunlight on Earth's surface each day.
Those two groups are identified from the variation in the duration of the first overeducation spell, conditional on observed characteristics.
Then we examine the variation in the duration of the succeeding call (in seconds) as a function of the length of the inter-event time.
The intuition behind the identification strategy intrinsic to the timing-of-events model is that there is some random variation in the duration until treatment.
Variation in the duration of transport to central laboratories needs to be considered by ensuring sample stability and proper storage conditions.
In the empirical work below, I examine how the unemployment experience of likely UI recipients responds to variation in the duration of UI benefits.
There was greater variation in the duration of ingesting milk within groups fed via a separate teat bar, but no effect of teat bar design was found on the variation in milk intake within the groups.
Consequently after controlling for age we assume that variation in the duration from the rollout start to the IMM is exogenous to each of the outcome variables (that is, independent of other unobserved factors that might affect outcomes).
Seasonal variation in the duration of grazing days (h d−1) of (a) cattle and (b) goat herds from Ankilibory (AK), Efoetse (EF), Andremba (AD), Miarintsoa (MI), and the transhumance cattle herds (C-T).
Ultimately, the effects of climate change on organisms during winter should be considered in the context of the subnivium, when warming could make more northerly areas functionally colder in winter, and changes in annual variation in the duration of snow-free but frozen conditions could lead to greater unpredictability in the onset and end of winter.
