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Volcano

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*"The confusion that arises in problems like Example 26.1 lies in the fact that movement*

is relative: from the point of view of someone in the pendulum’s rest frame,

the pendulum is standing still (except, of course, for the swinging motion),

whereas to someone in a frame that is moving with respect to the pendulum, it’s

the pendulum that’s doing the moving. To keep this straight, always focus on the

observer who is doing the measurement, and ask yourself whether the clock being

measured is moving with respect to that observer. If the answer is no, then the observer

is in the rest frame of the clock and measures the clock’s proper time. If the

answer is yes, then the time measured by the observer will be dilated—larger than

the clock’s proper time.

This confusion of perspectives led to the famous “twin paradox.” "

is relative: from the point of view of someone in the pendulum’s rest frame,

the pendulum is standing still (except, of course, for the swinging motion),

whereas to someone in a frame that is moving with respect to the pendulum, it’s

the pendulum that’s doing the moving. To keep this straight, always focus on the

observer who is doing the measurement, and ask yourself whether the clock being

measured is moving with respect to that observer. If the answer is no, then the observer

is in the rest frame of the clock and measures the clock’s proper time. If the

answer is yes, then the time measured by the observer will be dilated—larger than

the clock’s proper time.

This confusion of perspectives led to the famous “twin paradox.” "

Above is quoted from Serway physics. Like the last sentence above in quote I confused. Except last sentence, rest of explanation and problem solving help is not consider "twins paradox" results. Is not it?