If I can add my 20 cents worth, for general astronomy overviews , The Atlas Of The Southern Sky by Massey & Quirk and Universe, published by ABC Books. I suspect that this is the same as Astronomica as it says it was produced by Millenium House, they are 2 fine encyclopedic style books.
For more intermediate to advanced guides 2 books that go hand in hand are, the indispensable Hartungs Astronomical Objects for Southern Telescopes and Observing Handbook and Catalogue of Deep Sky Objects by Luginbuhl & Skiff. They cover both hemispheres nicely.
Going more in depth are the 3 volume sets Burnhams Celestial Handbook and The Night Sky Observers Guide. Between them they list a lifetimes worth of objects and combined with atlas' such as The Cambridge Star Atlas or Nortons' for basic stuff and moving up to The Cambridge Double Star Atlas which also contains plenty of dso's and then Uranometria and the Herald Bobroff ( if you can find one, out of print and rare, like Hartungs ) and no, I'm not selling mine, well maybe, if the price was right.
Cheers
Jeff
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