Measuring the position angle of one star relative to another
The positional angle (often denoted by PA, from the English P ositional a ngle ) is the angle between the line connecting two stars (for example, components of a double star) and the declination circle passing through one of them. It is counted from the north point through east, south, west, varies from 0 ° to 360 ° (often measured in radians ) The measurement is carried out, for example, with a positional micrometer, heliometer .
Links
- The positional angle // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- Positional angle - an article from the Great Soviet Encyclopedia .