a best sky atlas?

Question

who can tell me a good sky atlas for abservation

Answer 1

What's best for you depends on what you want to do with it. Here's some that I'm familiar with. I've split them into three categories - beginner atlases show stars down to around 6th magnitude, about what you can see naked eye in a dark sky, and include a few hundred deep sky objects; intermediate atlases are larger scale but still show enough sky to let you figure out where you're looking, and include a few thousand deep sky objects; what I'm calling advanced atlases are such large scale that you need another set of maps to figure where in the sky they're showing you.

Beginner:
Bright Star Atlas - Nice maps, only $10:
http://www.willbell.com/atlas/atlas1.htm
Cambridge Star Atlas - Nice maps and lots of deep sky objects plotted:
http://www.amazon.com/exec/obidos/tg/detail/-/0521800846/ref=pd_sl_aw_alx-jeb-9-1_book_16203999_1?tag2=amd-google-20
Norton's Star Atlas - Not the best maps, but doubles as an introductory astronomy text:
http://www.buytelescopes.com/product.asp?t=145&pid=3855&m=
Intermediate:
Sky Atlas 2000 -probably the most popular atlas, available in a variety of formats:
http://www.shopatsky.com/index.asp?PageAction=VIEWPROD&ProdID=861
Herald-Bobroff AstroAtlas - my personal favorite for use at the telescope, has 5 series of charts at various levels of detail including a good mag 6 atlas and many in-depth charts for the more crowded areas of the sky:
http://www.heraldbobroff.com/
Advanced:
Uranometria 2000.0 Deep Sky Atlas - 30,000 deep sky objects!:
http://www.willbell.com/u2k/index.htm
Millennium Star Atlas - over a million stars and 1500 charts:
http://www.shopatsky.com/index.asp?PageAction=VIEWPROD&ProdID=1108