Начало » Карл Сейгън
В този кратък откъс от телевизионния сериал „Космос“ американският астроном Карл Сейгън ни припомня как преди повече от 2000 г. Ератостен изчислява обиколката на Земята и доказва, че не е плоска. Още през първи век преди новата ера с помощта на уред за измерване на ъгли и знаейки разстоянието между Александрия и Сиене, той успява […]
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