Old instruments
Almanac Ephemeris
Direct answer
Almanac Ephemeris is the dated celestial-position data printed within an almanac for practical lookup.
Almanac Ephemeris is an almanac position section used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Logarithmic Table, Perpetual Calendar, Agricultural Almanac, Tide Table
Almanac Ephemeris is an almanac position section used in historical astronomy, timekeeping, or navigation.
An engraved functional orientation; the page explains the real instrument, method, or publication.
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Your daily Almanac letter
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The story behind Almanac Ephemeris
Annual ephemerides were among the defining technical contents of astronomical and nautical almanacs.
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The Book of the Sky
How people learned to read the sky, from Babylon to the day you were born.
Why Almanac Ephemeris matters
Almanac Ephemeris matters because it connects a general annual publication to exact astronomical circumstances used in observing or navigation.
Almanac Ephemeris in practice: an example
A nautical-almanac page lists daily Greenwich hour angles and declinations used to reduce a sight.
Where readings of Almanac Ephemeris go wrong
A popular almanac may round values too heavily for precise navigation or telescope work.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical and Navigational Almanacs - Official descriptions of the Astronomical Almanac, Nautical Almanac, and their tabular data.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Last updated
- 2026-09-26
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Common questions
What is Almanac Ephemeris?
Almanac Ephemeris is the dated celestial-position data printed within an almanac for practical lookup.
What do people get wrong about Almanac Ephemeris?
A popular almanac may round values too heavily for precise navigation or telescope work.
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One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
