Question: when was the astronomical clock in prague built
[{'answer': '1410', 'provenance': [{'wikipedia_id': '684873', 'title': 'Prague astronomical clock', 'start_paragraph_id': 2, 'start_character': 33, 'end_paragraph_id': 2, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '684873', 'title': 'Prague astronomical clock', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 411, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18390953505836750614}, 'section': 'Section::::History.\n'}]}]