caption: <PERSON> measures the Earth (c. 240 BC)
exif: {"Image DocumentName": "Eratosthenes measures the Earth (c. 240 BC)", "Image ImageDescription": "Measurements: Syene to Alexandria. distance \u2248 5000 stadia. angle = 7\u00b0 Calculate circumference of Earth: 7/360 \uf0b4 (circum. Earth) = 5000 stadia. \uf0de circum. Earth = 5000 \uf0b4 360/7 stadia \u2248 250,000 stadia. This slide based on the special topic box to show Eratosthenes calculation. Compare to modern value (\u2248 40,100 km): Greek stadium \u2248 1/6 km \uf0de 250,000 stadia \u2248 42,000 km.", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}