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Distant simultaneity is the notion that two spatially separate events occur at the same time. Special relativity maintains that distant simultaneity is not absolute. However, it depends on the observer's reference frame.
If two events are separated in space, then it is not possible to say absolutely that they have occurred simultaneously. They may appear, to an initial observer to have occurred simultaneously. These events may occur non-simultaneously when viewed from another initial observer. This is a lack of absolute simultaneity.
In this image, events A and B, in the green reference frame are simultaneous. However, in the blue reference frame, B occurred before and in the red reference frame, it will occur after.
Another example would be the map-clocks on spaceships. They may look unsynchronized as a consequence of the relativity of simultaneity in special relativity.
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