Some Feng Shui masters today love to boast about the authenticity of their Feng Shui knowledge. Some examine the facing of ancient graves to confirm their Feng Shui theory. Others examine the facing of temples built over a century.
They do not understand that the magnetic declination is changing all the time. The facing of a grave or a temple built 100 years ago is definitely different measured today and measured 100 years ago. If the measurement today fits their Feng Shui theory, then it should not have fit the same 100 years ago. What is the point?