If there is insufficient light to fly by visual information recieved then it is necessary to fly by reference to instruments and this is instrument flight and should be logged as such.
Not disputing this, I agree with it - and agree that "black hole" time is IF and should be legal to log.
What is plain wrong is any assertion that this is IMC, or that visibility, in the aviation context such as that received on the ATIS, is reduced at all, both of which you've stated. Dictionary definitions are irrelevant to determining whether VMC/IMC exists - and visibility (not what you can see but
specific visibility as per ATIS etc. in pitch black darkness with nil weather is greater-than-10km. Fact.
Ok, I think I'm done with this thread, done this to death
