Chalky wrote:

The observed error margin is ~ 5 E-5
The theoretical error margin is ~ 5 E-16

Just as the theoretical error margin requires an emission time of ~ 10
million years, the same applies for the required detection time. The
difference between the 2 error margins is ~ E 11 corresponding to a
required detection time of ~ 1 hour. This sounds reasonable.


It would be interesting to know
if the observational error margin ~ 5 E-5 Hz
in the observed frequency of astrophysical hydrogen 21 cm
1.4204057517667 GHz = 1,420,405,751.7667 Hz
represents a limit
below which astrophysical electromagnetic frequencies
cannot be observed.

Are any electromagnetic waves observed below 5 E-5 Hz ?

Richard D. Saam