Sorry, no online dictionaries contain the exact phrase periastron advance.
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Reverse dictionary results:
1. apsis
 2. apastron
3. farthest point
4. furthest point
5. a priori
6. above
7. academy
8. access
9. achievements
10. act on
 11. acton
12. ad lib
13. ad libitum
14. adduce
15. adducing
16. adumbration
17. advanced
18. advancement
19. advancements
20. advancer
 21. advances
22. advancing
23. aforethought
24. after
25. age
26. ahead
27. alert
28. anabasis
29. ante
30. antecede
 31. antecedently
32. antedate
33. anticipant
34. anticipate
35. anticipation
36. appointment
37. appreciated
38. appreciating
39. approach
40. approximate

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You can look up the words in the phrase individually using these links:   periastron ?   advance ?
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