Phase
A phase is one part of a cycle or change that goes in a circle. For example, the moon has phases. The seasons of the year, spring, summer, fall, and winter, …
A phase is one part of a cycle or change that goes in a circle. For example, the moon has phases.
The seasons of the year, spring, summer, fall, and winter, are also phases. The planet Venus has phases, like the moon: Galileo showed that the phases of Venus meant it must go around the Sun, not the earth.
Graphs can be made for things that have phases. Things that have phases change in some regular way from time to time. For example, a pendulum in a clock moves from some position (called its "displacement") to the left (labelled -x with algebra), to the bottom, and then to some position to the right (labelled +x with algebra). Two pendulums may have the same length, but unless they begin swinging at the same time and place they will not move together. One may be swinging left while the other swings right. When something like that happens the two vibrations are "not in phase."
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