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Growth rings are the rings that can be seen when a tree is cut. The outer portion is the late wood, and is denser than early wood. The inner part of a growth ring is formed early in the growing season, when growth is fast and is known as early wood. Tree rings grow under the bark, and the bark is pushed out while the tree is growing. The growth ring in furniture, walls and other wooden things can be counted, too.Tree ring growth patterns are affected by the climate, weather, rain, temperature, soil p H, plant nutrition, CO concentration, and sunspots.
These changes in direction of a static field, because of relativistic considerations, are the same for an observer when a distant charge is moving, as when an observer (instead) decides to move with respect to a distant charge.
Thus, constant motion of an observer with regard to a static charge and its extended static field (either a gravitational or electric field) does not change the field.
For static fields, such as the electrostatic field connected with electric charge, or the gravitational field connected to a massive object, the field extends to infinity, and does not propagate.
Thus, the speed of "light" is also the speed of gravitational waves and any massless particle.
Such particles include the gluon (carrier of the strong force), the photons that make up light (hence carrier of electromagnetic force), and the hypothetical gravitons which make up the associated field particles of gravity (however a theory of the graviton requires a theory of quantum gravity).