Question: points on a sphere or angles in a circle are measured in units called
[{'answer': 'radians'}, {}, {'provenance': [{'wikipedia_id': '1196', 'title': 'Angle', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17771162252827971321}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24041303', 'title': 'Hour circle', 'section': 'Section::::Abstract.', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['A meridian on the celestial sphere matches an hour circle at any time. The hour circle is a subtype whereby it is expressed in hours as opposed to degrees, radians, or other units of angle', 'A meridian on the celestial sphere matches an hour circle at any time. The hour circle is a subtype whereby it is expressed in hours as opposed to degrees, radians, or other units of angle.', 'The hour circle is a subtype whereby it is expressed in hours as opposed to degrees, radians, or other units of angle. The hour circles make for easy']}}]}]