It is not unusal that someone want their 4P read but
do not have birth hour info.

This is a 25% missing data scenario!

Of course, we can try all 12 possible hour pillars,
but it is a lot of work. And the 4P reader cannot
charge more most of the time.

Here are the known methods to determine birth hour. I
do not show the actual details here, but at least you
know their existence.

Methods for guessing birth hour:

1. based on birth order of DM (hint: this is similar
to yin FS on reading the tombstone)

2. based on the sleeping posture of the DM

3. based on the location of DM’s hair ring

4. based on events like moving, promotion, changing
job, immigration and studying aboard.

Ken Lai