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Size or extent.
References in periodicals archive ?
The expansion of the Universe adds up to the Euclidean distance, and therefore the apparent magnitude of the source of light is fainter than if no expansion was present.
Books tend to list the apparent magnitude at around 7, suggesting it is an easy object, though for many years it was considered to be quite a tricky test.
The connection between colour perception and apparent magnitude is well illustrated by the following anecdote.