Question: what does the red circle on the japanese flag mean
[{'answer': 'the sun', 'provenance': [{'wikipedia_id': '144954', 'title': 'Flag of Japan', 'start_paragraph_id': 2, 'start_character': 244, 'end_paragraph_id': 2, 'end_character': 251, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '144954', 'title': 'Flag of Japan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 232, 'bleu_score': 0.673097149735652, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14319202265529497949}, 'section': 'Section::::Abstract.'}]}]