--- title: "6 Circumference Earth Quotes by 4 authors" description: "Browse 6 Circumference Earth quotes by 4 authors. Discover the best Circumference Earth sayings and thoughts." image: "https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg" --- > [“For the observed difference in the shadow lengths, the distance between Alexandria and Syene had to be about seven degrees along the…](https://sms4smile.com/quotes/carl-sagan/for-the-observed-difference-in-the-shadow-lengths-the-distance/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg) > [I walk alone in the darkness and wonder how a person would begin to determine the circumference of the earth. I have…](https://sms4smile.com/quotes/robin-sloan/i-walk-alone-in-the-darkness-and-wonder-how-a-person-would-begin-to/) [Robin Sloan](https://sms4smile.com/quotes/author/robin-sloan/) [Image](https://sms4smile.com/quotes/i/17d/robin-sloan-1513_circumference_i-walk-alone-in-the-darkness-and-wonder_968447.png) > [Eratosthenes's only tools were sticks, eyes, feet, and brains; plus a zest for experiment. With those tools he correctly deduced the circumference…](https://sms4smile.com/quotes/carl-sagan/eratosthenes-s-only-tools-were-sticks-eyes-feet-and-brains-plus-a/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/7b8/carl-sagan-160_atheism_eratosthenes-s-only-tools-were-sticks-ey_1459920.jpg) > [Ten decimal places of π are sufficient to give the circumference of the earth to a fraction of an inch, and thirty…](https://sms4smile.com/quotes/simon-newcomb/ten-decimal-places-of-are-sufficient-to-give-the-circumference-of-the/) [Simon Newcomb](https://sms4smile.com/quotes/author/simon-newcomb/) [Image](https://sms4smile.com/quotes/i/e59/simon-newcomb-16581_decimals_ten-decimal-places-of-are-sufficient-to_1542805.jpg) > [Remembering that Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered from the course of the sun, the shadows cast by…](https://sms4smile.com/quotes/marcus-vitruvius-pollio/remembering-that-eratosthenes-of-cyrene-employing-mathematical/) [Marcus Vitruvius Pollio](https://sms4smile.com/quotes/author/marcus-vitruvius-pollio/) [Image](https://sms4smile.com/quotes/i/819/marcus-vitruvius-pollio-7498_casts_remembering-that-eratosthenes-of-cyrene_2022004.png) > [“Columbus therefore cheated on his calculations, as the examining faculty of the University of Salamanca quite correctly pointed out. He used the…](https://sms4smile.com/quotes/carl-sagan/columbus-therefore-cheated-on-his-calculations-as-the-examining/) [Carl Sagan](https://sms4smile.com/quotes/author/carl-sagan/) [Image](https://sms4smile.com/quotes/i/3d1/carl-sagan-160_quote_columbus-therefore-cheated-on-his-calcul_2245198.jpg) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "ItemList", "@id": "https://sms4smile.com/quotes/about/circumference-earth/#itemlist", "name": "Circumference Earth Quotes", "numberOfItems": 6, "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@type": "Quotation", "text": "“For the observed difference in the shadow lengths, the distance between Alexandria and Syene had to be about seven degrees along the surface of the Earth; that is, if you imagine the sticks extending down to the center of the Earth, they would there intersect at an angle of seven degrees. Seven degrees is something like one-fiftieth of three hundred and sixty degrees, the full circumference of the Earth. Eratosthenes knew that the distance between Alexandria and Syene was approximately 800 kilometers, because he hired a man to pace it out. Eight hundred kilometers times 50 is 40,000 kilometers: so that must be the circumference of the Earth.”", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/for-the-observed-difference-in-the-shadow-lengths-the-distance/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg", "contentUrl": "https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg", "url": "https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg", "width": 1080, "height": 1080, "caption": "“For the observed difference in the shadow lengths, the distance between Alexandria and Syene had to be about…” — Carl Sagan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 2, "item": { "@type": "Quotation", "text": "I walk alone in the darkness and wonder how a person would begin to determine the circumference of the earth. I have no idea. I’d probably just google it.", "creator": { "@type": "Person", "name": "Robin Sloan" }, "url": "https://sms4smile.com/quotes/robin-sloan/i-walk-alone-in-the-darkness-and-wonder-how-a-person-would-begin-to/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/17d/robin-sloan-1513_circumference_i-walk-alone-in-the-darkness-and-wonder_968447.png", "contentUrl": "https://sms4smile.com/quotes/i/17d/robin-sloan-1513_circumference_i-walk-alone-in-the-darkness-and-wonder_968447.png", "url": "https://sms4smile.com/quotes/i/17d/robin-sloan-1513_circumference_i-walk-alone-in-the-darkness-and-wonder_968447.png", "width": 1080, "height": 1080, "caption": "“I walk alone in the darkness and wonder how a person would begin to determine the circumference of the…” — Robin Sloan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 3, "item": { "@type": "Quotation", "text": "Eratosthenes's only tools were sticks, eyes, feet, and brains; plus a zest for experiment. With those tools he correctly deduced the circumference of the Earth, to high precision, with an error of only a few percent. That's pretty good figuring for 2200 years ago.", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/eratosthenes-s-only-tools-were-sticks-eyes-feet-and-brains-plus-a/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/7b8/carl-sagan-160_atheism_eratosthenes-s-only-tools-were-sticks-ey_1459920.jpg", "contentUrl": "https://sms4smile.com/quotes/i/7b8/carl-sagan-160_atheism_eratosthenes-s-only-tools-were-sticks-ey_1459920.jpg", "url": "https://sms4smile.com/quotes/i/7b8/carl-sagan-160_atheism_eratosthenes-s-only-tools-were-sticks-ey_1459920.jpg", "width": 1080, "height": 1080, "caption": "“Eratosthenes's only tools were sticks, eyes, feet, and brains; plus a zest for experiment. With those tools…” — Carl Sagan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 4, "item": { "@type": "Quotation", "text": "Ten decimal places of π are sufficient to give the circumference of the earth to a fraction of an inch, and thirty decimal places would give the circumference of the visible universe to a quantity imperceptible to the most powerful microscope.", "creator": { "@type": "Person", "name": "Simon Newcomb" }, "url": "https://sms4smile.com/quotes/simon-newcomb/ten-decimal-places-of-are-sufficient-to-give-the-circumference-of-the/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/e59/simon-newcomb-16581_decimals_ten-decimal-places-of-are-sufficient-to_1542805.jpg", "contentUrl": "https://sms4smile.com/quotes/i/e59/simon-newcomb-16581_decimals_ten-decimal-places-of-are-sufficient-to_1542805.jpg", "url": "https://sms4smile.com/quotes/i/e59/simon-newcomb-16581_decimals_ten-decimal-places-of-are-sufficient-to_1542805.jpg", "width": 1080, "height": 1080, "caption": "“Ten decimal places of π are sufficient to give the circumference of the earth to a fraction of an inch, and…” — Simon Newcomb", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 5, "item": { "@type": "Quotation", "text": "Remembering that Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered from the course of the sun, the shadows cast by an equinoctial gnomon, and the inclination of the heaven that the circumference of the earth is two hundred and fifty-two thousand stadia, that is, thirty-one million five hundred thousand paces.", "creator": { "@type": "Person", "name": "Marcus Vitruvius Pollio" }, "url": "https://sms4smile.com/quotes/marcus-vitruvius-pollio/remembering-that-eratosthenes-of-cyrene-employing-mathematical/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/819/marcus-vitruvius-pollio-7498_casts_remembering-that-eratosthenes-of-cyrene_2022004.png", "contentUrl": "https://sms4smile.com/quotes/i/819/marcus-vitruvius-pollio-7498_casts_remembering-that-eratosthenes-of-cyrene_2022004.png", "url": "https://sms4smile.com/quotes/i/819/marcus-vitruvius-pollio-7498_casts_remembering-that-eratosthenes-of-cyrene_2022004.png", "width": 1080, "height": 1080, "caption": "“Remembering that Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered…” — Marcus Vitruvius Pollio", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } }, { "@type": "ListItem", "position": 6, "item": { "@type": "Quotation", "text": "“Columbus therefore cheated on his calculations, as the examining faculty of the University of Salamanca quite correctly pointed out. He used the smallest possible circumference of the Earth and the greatest eastward extension of Asia he could find in all the books available to him, and then exaggerated even those. Had the Americas not been in the way, Columbus’ expeditions would have failed utterly.”", "creator": { "@type": "Person", "name": "Carl Sagan" }, "url": "https://sms4smile.com/quotes/carl-sagan/columbus-therefore-cheated-on-his-calculations-as-the-examining/", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/3d1/carl-sagan-160_quote_columbus-therefore-cheated-on-his-calcul_2245198.jpg", "contentUrl": "https://sms4smile.com/quotes/i/3d1/carl-sagan-160_quote_columbus-therefore-cheated-on-his-calcul_2245198.jpg", "url": "https://sms4smile.com/quotes/i/3d1/carl-sagan-160_quote_columbus-therefore-cheated-on-his-calcul_2245198.jpg", "width": 1080, "height": 1080, "caption": "“Columbus therefore cheated on his calculations, as the examining faculty of the University of Salamanca…” — Carl Sagan", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } } } ] }, { "@type": "CollectionPage", "@id": "https://sms4smile.com/quotes/about/circumference-earth/#webpage", "url": "https://sms4smile.com/quotes/about/circumference-earth/", "name": "Circumference Earth Quotes", "isPartOf": { "@id": "https://sms4smile.com/quotes/#website" }, "mainEntity": { "@id": "https://sms4smile.com/quotes/about/circumference-earth/#itemlist" }, "primaryImageOfPage": { "@id": "https://sms4smile.com/quotes/i/f01/carl-sagan-160_quote_for-the-observed-difference-in-the-shado_681524.jpg" }, "description": "Browse 6 Circumference Earth quotes by 4 authors. 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