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Why in "Contact" film in 1997 if I remember. The frequency for receving signal from aliens is Hydrogen times Pi?

I can understand, at least grasp, that the frequency uses Hydrogen frequency, because it's the most simple element. Can't use 92.0 MHz as Sonora Radio in Jakarta, because 92,000,000 is too human. Elshinta's 90.0 Mhz can't be used either.

So it's hydrogen, considering the alien will use other than base 10 number.

Why Pi?

Because the scientist afraid that the hydrogen frequency will be altered by the frequency of the stars. So, times Pi to avoid confusion. Since Pi is irrational. (Is it? But I think that belongs to Math forum to prove it )

Of course we can't use Hubble constant, or Avogadro number.

[EDIT:]Why not Phi?

Golden ratio is irrational, too. Or because golden ratio is too simple ##\frac{\sqrt{5}+1}{2}##?

Why not Euler number? or Natural Log(2) or square root of 2?

Do SETI also monitor Hydrogen times Phi and Hydrogen times Euler?

Why Pi?

Thanks for any discussion.

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# B Hydrogen times Pi

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