The most common and most likely answer to this crossword clue is the 8 letter word PARALLAX
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More clues leading to the result PARALLAX
Buddy explains!
The straight part
We know that "apparent change of position" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case apparent change of position = parallax.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARALLAX mean?
PARALLAX noun- An apparent shift in the position of two stationary objects relative to each other as viewed by an observer, due to a change in observer position.
- The angle of seeing of the astronomical unit.
- To measure (a distance) based on parallax observations.
- To produce an illusion of levels of distance by shifting layers at different rates.