Sorry, no online dictionaries contain the exact phrase planetary ephemeris.
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Reverse dictionary results:
1. ephemeris time
2. ephemerist
3. tdt
4. epoch
5. almanac
6. astronomical
7. calendar
8. full
9. monitoring
10. arrival
11. ephemerides
12. aberration
13. albedo
14. astrology
15. axis
16. callisto
17. core
18. direct
19. directing
20. directionally
21. dorsum
22. earth
23. eclipse
24. ellipse
25. epicyclic train
26. fixed star
27. globe
28. god
29. house
30. kite
31. macula
32. mansion
33. mars
34. orbit
35. orbiter
36. orrery
37. phobos
38. planetary gear
39. planetesimal
40. planetoid

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You can look up the words in the phrase individually using these links:   planetary ?   ephemeris ?
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