A must read.
Many people (whether influenced more by Einstein’s special theory of relativity or the TARDIS) think of space and time as intricately linked dimensions; we describe the position of an object in space using three dimensions, and time represents the fourth dimension. Doctor Who, in his multi-dimensional policebox, is capable both of travelling throughout the universe and throughout the ages.
The concept of four-dimensional spacetime was challenged recently by a group of scientists who argue that time, in itself, is not a fundamental entity – it is merely a measure of the numerical order of changes in space. Nevertheless, whether dimension or not, time is a crucial factor to consider when interpreting spatial data. We not only need to know where something is, but when it was there.
Time and Maps
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