98 jbml thln to specify a reference frame


IN PHYSICS
REQUIRES FOUR AXES,
WHICH CAN BE THOUGHT OF
AS MEASURING DEVICES ~ THREE MEASURING STICKS
(RULERS) AND A CLOCK, LEAVING ASIDE SPECULATION ABOUT ADDITIONAL DIMENSIONS.

A DIMENSION IS ANY DIRECTION ALONG WHICH ONE CAN POINT A MEASURING DEVICE
IN ORDER TO MEASURE SOME SENSE OF SEPARATION (spatial or temporal) THAT CANNOT BE MEASURED OR KNOWN
BY A DIFFERENT COMBINATION OF MEASUREMENTS.

AS LONG AS
THE MEASURING DEVICES
EXTEND INTO ALL FOUR DIMENSIONS,
THEIR PARTICULAR ORIENTATION
DOES NOT AFFECT THE ABILITY.

TO MAKE
MEASUREMENTS
AND RELATE THESE TO MEASUREMENTS
MADE WITH RESPECT TO DIFFERENTLY
ORIENTED AXES.

SO THEIR IS NO
EXCUSE FOR A CULTURE WAR
IN THE FACT THAT A BOX 40 INCHES HIGH & 30 INCHES WIDE
WILL BE DESCRIBED AS 30 INCHES HIGH AND 40 INCHES WIDE BY AN OBSERVER WHO HAS EXCHANGED
THE "HIGH"-AXES AND "WIDE"-AXIS & SIMILARLY, RELATIVITY IS SPACE-TIME STATES
THAT A PAIR OF EVENTS OBSERVED IN ONE FRAME AS OCCURRING SIMULTANEOUSLY
AT DISTANCE OF 30 INCHES MAY BE OBSERVED IN A
DIFFERENT FRAME TO OCCUR SEQUENTIALLY
(one after the other)
AT A DISTANCE
OF 29 INCHES.

THE EVENTS
HAVE NOT CHANGED,
BUT THE OBSERVED SPATIAL AND TEMPORAL SEPARATIONS DEPEND
ON THE OBSERVER'S FRAME
OF REFERENCE.
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