Glossary of Printing Terms:
Screen Angles

The angles at which the halftone screens must be place in relation to each other in order to avoid a moiré pattern from forming.

The common angles used are black at 45°, magenta at 75°, yellow at 90°, and cyan at 105°.

With regular screens the angle of the screen from the vertical.

When single colors are used, the screen is generally positioned diagonally (45° or 135°).