Visual Astronomy of the Deep Sky by Roger N. Clark
My rating: 4 of 5 stars
Here's a title that clearly stands out as just not another run-of-the-mill backyard astronomy book.
To tell the truth, I'm still to verify its claims and axioms behind my "8-incher" SCT, but, given the apparent accuracy of the author's own observational data, it is obvious that the proposed techniques are indeed based on numerous hours (spanning for nearly a decade!) of practical, down-to-earth amateur astronomy - instead of mere complex paradigms sprinkled with scientific, formulae.
The scope of the author's claims go as far as to challenge old, worn-out formulae such as the maximum observable magnitude for a given aperture and so on based, again, on his empirism rather than accepting whatever conventions other books take for granted without actually trying them.
So, for this reason alone, as I mentioned in the beginning, this methodical work does stand out from others.
If anything, given its price, I'd suggest trying to find it first at your local library - just as I did - and see first if said brand new approach it proposes itself, will really do for you.
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