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 this latter sense the ephemeral is the antithesis of historiography, whose purpose is to express meaning through the creation of enduring memories, particularly as they pertain to events in the public sphere.