Question: who was the individual who is credited with establishing the size of earth
[{'answer': 'Eratosthenes', 'provenance': [{'wikipedia_id': '244588', 'title': 'Heliocentrism', 'start_paragraph_id': 16, 'start_character': 111, 'end_paragraph_id': 16, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Ancient and medieval astronomy.:Classical Antiquity.:Aristarchus of Samos.\n'}]}]