time and place

hi !
may i ask you a locical question ?
i dont want to disturb you in this list but i this problem
doesnt let me sleep well.

root-words are:
NOW (with the meaning of "right now" or "this time").
HERE (with the meaning of "right here" or "this place").
AHEAD (with the meaning of "in front of").
AFTER (with the meaning of "behind").

i combine "ahead and after" with temporal "now" and lokative "here".
think of a man who is on the way walking from home to the church.
he started walking at 7:00 o'clock and he plans to arrive at the church at 8:00 o'clock.
his home lies *after* him. the church lies *ahead* of him.

the church is his target-place. it is *ahead here*. so far so good.
"8 o'clock" is his target-time. it is *ahead now*. so far so good.
his home is his origin-place. it is *after here*. so far so good.
"7' o'clock" is his origin-time. it is *after now*. wait ? after now ? something
is wrong with this..
this logic is turned upside down.
how come that we use the term "after" in the temporal way that we refer to future (target time),
but say "after" in the lokative way that we refer to a left-behind-place (origin place) ??
wouldnt it be more logical to say "after this time" when we refer to the past ?
we have the same weird "up-side-down-logic" in other languages, and i dont get it.

regards,
c.s.