Attention deficit hyperactivity disorder (ADHD) should be diagnosed and treated in children as young as age 4, according to new guidelines from the American Academy of Pediatrics. Skip to main content
ephemeris. 1  a table showing the positions of a heavenly body on a number of dates in a regular sequence. 2  an astronomical almanac containing such tables. 3  Archaic. an almanac or calendar.
In library and information science, the term ephemera also describes the class of published single-sheet or single page documents which are meant to be thrown away after one use. This classification excludes simple letters and photographs with no printing on them, which are considered manuscripts or typescripts.