I don't know if this has ever occurred to anyone or not. But it has occurred to me.

What it is,- I find it useful to divide the entire sky above you, -right down to the horizon, -into 5ths. For a quick visualization and evaluation standpoint. In my experience, -a fifth of the sky, -is all that the human eyes can comfortably take in at a time.

What they are,- Directly ahead of you, Directly behind you, Directly to your left, Directly to your right, and Directly above you, -centering on the sky's general zenith or midpoint.Irregardless of what 0 to 360 degree starting point as you may have.

You can quickly take in and evaluate each fifth, put it all together in your mind, and know that you havn't missed any of the sky, -in such survey. [color:"black"] [/color] [email]Ors[/email]