4 syllables: Ep, he, mer, is. Stress on mer.
ef-uh-MIR-is
/ˌɛfəˈmɪrɪs/
Ephemeris is pronounced ef-uh-MIR-is (/ˌɛfəˈmɪrɪs/). It has four syllables (Ep-he-mer-is), with the stress on "mer". Ephemeris is a noun referring to a table or data set that lists the positions of celestial bodies (such as stars or planets) at given times. It is used by astronomers and navigators to predict objects’ locations for a specific period. The term emphasizes a time-bound, reference data collection rather than current observations alone.
nounEphemeris is a noun referring to a table or data set that lists the positions of celestial bodies (such as stars or planets) at given times. It is used by astronomers and navigators to predict objects’ locations for a specific period. The term emphasizes a time-bound, reference data collection rather than current observations alone.
"The astronomer consulted the ephemeris to determine when the conjunction would occur."
"Sailors relied on the ephemeris to chart their course before the era of modern GPS."
"The software imports the ephemeris to display accurate planetary positions."
Pronounce as ih-FEM-uh-ris, with primary stress on the second syllable. IPA: US ɪˈfɛmərɪs; UK ɪˈfɛmərɪs; AU ɪˈfɛmərɪs. Start with a short i like in “kit,” then FE-mə-ris, ensuring the second syllable carries the strongest emphasis. Think of the “ph” as /f/ and keep the final r and is crisp but not rolled. Listening tip: align your rhythm to a three-beat pattern: ih- FE- mə- ris, aligning the stress on FE.
Common errors: (1) stressing the first syllable as EE-phem-er-is and (2) pronouncing the second vowel as a long e (ee-FEM-er-is). Correction: keep the initial vowel short (ih), place primary stress on FE, and use a short, schwa-like middle vowel. (3) mispronouncing the final -is as “ee-us” or “eye-us.” Correction: keep final syllable short and crisp: -ris, with a light but clear /ɪs/ ending.
In US, UK, and AU, the core is /ɪˈfɛmərɪs/. Minor differences: US tends to a tighter vowel in the first syllable; UK often rounds the /ɪ/ toward a shorter, clipped sound; AU may have a slightly broader vowel and a softer /r/ depending on speaker. The rhotic difference is minimal in non-rhotic UK speech, where the /r/ can be less pronounced. Overall, the stress pattern remains on the second syllable across all three.
Two main challenges: the cluster ph representing /f/ after an unstressed initial syllable and the final -is pronounced /ɪs/, not /iːs/. The second syllable FE should be emphasized without elongating the vowel. Additionally, the initial ih is short and quick. Practicing in slow tempo helps you segment: ih-FE-mər-is, then speed up while keeping the stress on FE and crisp final consonant.
The word’s emphasis falls on the second syllable, which is a relatively unusual stress pattern for four-syllable scientific nouns starting with i- and containing -eris. Visualize a three-beat rhythm: ih-FE-mər-IS, with the final -is lightly voiced. The “ph” yields /f/, and the ending /ɪs/ remains short. This nuance helps distinguish Ephemeris from similar terms like “ephemeral” or “ephemerid.”
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Ephemeris comes from the Late Latin ephemeris, from Greek ephēmeris, meaning “diary” or “a daily record,” from ephēmerēs, meaning “lasting only a day.” The Greek term itself derives from epi- “upon” + hēmera “day.” In classical astronomy, ephemerides were daily tables predicting celestial positions, later evolving into more complex astronomical catalogs and navigational almanacs. The word entered English in the 17th century with the sense of a daily record or table used to track astronomical configurations. Over time, “ephemeris” broadened in scholarly use to denote any systematic data table that lists time-indexed positions, not just celestial bodies. The plural form “ephemerides” is common in scientific literature, though “ephemeris” is often treated as a mass noun in modern usage. The term remains central in astronomy, astrology, and navigation, especially in contexts requiring precise timing for observing events or determining planetary coordinates. The word’s longevity reflects the long-standing human need to organize time-bound spatial data for predictive calculations. transitions to digital catalogs but retains its original sense of a time-specific reference table.
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Words that rhyme with "Ephemeris"
-ers sounds
-ris sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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