Question: what is the date of the autumnal equinox
[{'answer': '23 September', 'provenance': [{'wikipedia_id': '10100', 'title': 'Equinox', 'start_paragraph_id': 1, 'start_character': 218, 'end_paragraph_id': 1, 'end_character': 230, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]