He calculated that the circumference (圆周) of the Earth was 28,600 miles ( 46,000 kilometers). Actually, The true size of the Earth is 25,000miles (40,000 kilometers ).Eratosthenes's measurement was wrong, but it was very close to the truth.For many centuries after Eratosthenes lived,...
The polar circumference of the Earth is 40,008 kilometers. What is the equatorial circumference? How far away is Rigel? How many AU are there in 6.50 ly (light-years)? Express your answer using three significant figures. What is angular distance in astronomy? How far is Aldebaran from Eart...
Eratosthenes was sure that the Earth was a sphere. He used the sun and geometry(几何学) to figure out the size of the Earth. He calculated that the circumference(圆周) of the Earth was 28, 600 miles(46, 000 kilometers).The true size of the Earth is 25, 000 miles (40, 000 kilo...
How would the speed of Earth's orbit around the sun change if Earth's distance from the sun increased by 4 times?Suppose the radius of the earth is given to be 6378.01 km. Express the circumference of the earth in meters.Earth is approximately a sphere of radius 6.37 \times...
29.C,细节理解题,根据第二段"He calculated that the circumference(圆周) of the Earth was 28,600 miles(46,000 kilometers). "他计算出的地球的圆周周长是28600英里(46000公里),可知,他确信地球是圆的,故sphere是一个球体,故选C.30.B,词义猜测题,根据第二段大意可知,Eratosthenes 测算出地球的周长,可知...
What is Earth's volume, mass, density and surface area? The volume of Earth is 260 billion cubic miles (1.086 trillion cubic kilometers), while its mass is 6.6 x 1021 tons (6 x 1021 metric tons), according to NASA. With these values known, and Earth's oddball shape accounted for, ...
A book is 7.5 inches long. How many centimeters long is the book? Imperial to Metric Conversions: The metric system of measurements is used by every country in the world except for the United States. As such, regular conversions between the metric and imperial systems are necessary, especi...
"The Andes Mountains, 287 miles [462 kilometers] away, and although taller than the plane's altitude, lay below the sensible horizon, marked by the white horizontal line in the photograph," NASA officials wrote in adescription of the flight. "The Earth's curvature explains this phenomenon, ...
WithAustraliastretching over 7 million square kilometers (2,968,000 square miles), it should come as no surprise that it takes a long time to get around the country. Considering the distances, it’s no wonder few people end up traveling the whole country — there’s just too much ground...
Multiplying by pi yields a circumference of something like 24,900 miles (40,065 kilometers). To travel around that circumference in 24 hours, a point on Earth's surface has to move at 1,038 mph (1,669 kph). A launch from Florida's Cape Canaveral doesn't get as big a boost from ...