The term 'Like September's Equinox' can be solved by the crossword solution 'Autumnal', which is an 8-letter word. The equinox is an astronomical event that occurs twice a year, in March and September, when the sun crosses the equator and day and night are of equal length. The September equinox marks the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. Therefore, the crossword solution 'Autumnal' is appropriate for this term as it refers to the season of autumn.