11. The latter dependence follows a reciprocity law, meaning that dislocations images become narrower inversely as the angular distance grows. 12. Longitude ( symbol ) measures the angular distance of an object eastward along the galactic equator from the galactic center. 13. He is also credited to have invented the Jacob's staff, an instrument to measure the angular distance between celestial objects. 14. The BC pair lies at an angular distance of 177 arc-seconds from Regulus A, making them visible in amateur telescopes. 15. The difference in the two micrometer readings so obtained is the apparent separation or angular distance between the two stars. 16. When both objects are in the same view, aligning them together allows the navigator to measure the angular distance between them. 17. This is then subtracted from 90?to obtain the angular distance from the position directly above to obtain the zenith distance. 18. This equation breaks down at the zenith where the angular distance between the observed pointing and the zenith, ? s is 0. 19. The Xbox 360 copy protection functions by requesting the DVD drive compute the angular distance between specific data sectors on the disc. 20. The position angle of the secondary with respect to the primary is measured, together with the angular distance between the two stars.
