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Answer:
When you use a time machine to go back in time (in the past) or forward (in the future)
Explanation
An absolute location consists on the description of the exact site on an objective coordinate system, such as a grid.
When refering to a map or the Earth, the absolute location refers to the latitude and the longitude of a specific place. Those are the coordinates which allow a person to indentify an absolute location. Nowadays, there exist innovated devices which allow a person to find an absolute location on Earth, such as GPS or Google Earth.