The postmillenial bit on the picture is not 100% accurate; there are different views among postmils about what the millennium is:
1. Some hold its a golden-age within the NT, as is represented in the graphic.
2. Some hold its the whole NT age, as with Amils.
3. Some hold its from 70 AD until a rebellion against Christendom "Satan's little season".
The main difference between amillennial and postmillennials is the latter believes that the gospel will advance much more in the NT age.
Saintfield, Northern Ireland - Queen's University, Belfast:History/Politics
Member of Dromara Reformed Presbyterian Church of Ireland (Covenanter)