Full Idea
Objects in the B-series are earlier than, later than, or simultaneous with each other, whereas objects in the A-series are earlier than, later than or simultaneous with the present.
Gist of Idea
B-series objects relate to each other; A-series objects relate to the present
Source
Craig Bourne (A Future for Presentism [2006], Intro IIb)
Book Reference
Bourne,Craig: 'A Future for Presentism' [OUP 2006], p.8
A Reaction
Must we choose? Two past events relate to each other, but there is a further relation when 'now' falls between the events. If I must choose, I suppose I go for the A-series view. The B-series is a subsequent feat of imagination. McTaggart agreed.