Full Idea
Given events ordered in a B series, one defines an infinitude of different A series that correspond to taking different events as 'now' or 'present'. McTaggart talks of 'the A series' when there is an infinitude of such.
Gist of Idea
There is one ordered B series, but an infinitude of A series, depending on when the present is
Source
Tim Maudlin (The Metaphysics within Physics [2007], 4.3 n11)
Book Reference
Maudlin,Tim: 'The Metaphysics within Physics' [OUP 2007], p.126
A Reaction
This strikes me as a rather mathematical (and distorted) claim about the A series view. The A-series is one dynamic happening. Not an infinity of static times lines, each focused on a different 'now'.