A book or table listing nautical, astronomical, astrological or other events for the year; sometimes, but not essentially, containing historical and statistical information.
A handbook, typically published annually, containing information on a particular subject
A GPS signal consisting of coarse orbit and status information for each satellite in the constellation.
A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination.
Computer software that calculates the apparent position of celestial bodies.