ephemeris

As nouns the difference between nychthemeron and ephemeris

is that nychthemeron is a period of one day and one night, a date: in the west, this is a period of 24 consecutive hours while ephemeris is (obsolete|singular or plural) a journal or diary.

As nouns the difference between ephemeris and almanac

is that ephemeris is a journal or diary while almanac is {{cx|astronomy|navigation|lang=en}} A book or table listing nautical, astronomical, astrological or other events for the year; sometimes, but not essentially, containing historical and statistical information.

As an adjective ephemeric

is ephemeral.

As a noun ephemeris is

a journal or diary.

As nouns the difference between ephemeris and ephemerids

is that ephemeris is (obsolete|singular or plural) a journal or diary while ephemerids is .

As nouns the difference between ephemeris and ephemerid

is that ephemeris is (obsolete|singular or plural) a journal or diary while ephemerid is (zoology) any member of the ephemeridae.

As nouns the difference between ephemeris and ephemerist

is that ephemeris is (obsolete|singular or plural) a journal or diary while ephemerist is one who studies the daily motions and positions of the planets.