Synonyms of orbital

2 Syllables

weekly, annual, monthly, daily, hourly, yearly, rhythmic, cyclic, serial

3 Syllables

routine, perennial, regular, sporadic, infrequent, cyclical, recurring, fluctuating, spasmodic, periodic, recurrent, centennial, epochal, seasonal, repeated

4 Syllables

occasional, alternate, intermittent, isochronous, periodical, isochronal

6 Syllables

on-again-off-again