Brightness, altitude & azimuth for satellites?
Altitude is measured in degrees above the horizon, from 0&deg; on the horizon to 90&deg; directly overhead.
Your fist appears about 10&deg; wide at arm's length away from your eye.

Azimuth is measured along the horizon, usually with north 0&deg;, east 90&deg;, south 180&deg; west 270&deg;, and other directions (e.g. NNE, ENE) interpolated as in the compass image.

Magnitude is a logarithmic scale in which the brightest stars are 0 or 1, and the faintest stars visible to the unaided eye are 4 or 5 (maybe 2 or 3 in a city, or 6 in a remote area).

Each row of Heavens-Above's table links to a sky chart showing their predicted path for that satellite pass.
The brightness listed in the main table is a maximum; the table under the sky chart shows a brightness for other points on the path.