Question: when does the sun reach tropic of cancer
[{'answer': 'on the summer solstice', 'provenance': [{'wikipedia_id': '15055898', 'title': 'Sun path', 'start_paragraph_id': 12, 'start_character': 35, 'end_paragraph_id': 12, 'end_character': 57, 'bleu_score': 1.0, 'section': "Section::::Effect of the Earth's axial tilt.:Shadow of a vertical stick at solar noon.\n"}]}, {'provenance': [{'wikipedia_id': '15055898', 'title': 'Sun path', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 646, 'bleu_score': 0.983401048538667, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3408519337242821443}, 'section': "Section::::Effect of the Earth's axial tilt.:Shadow of a vertical stick at solar noon.\n"}]}]