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...
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,...
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 the distance from Mars to the sun? How many kilometers equals one astronomical unit? What is the circumference and diameter of Earth? How long is an astronomical unit in miles? How many miles is the Kuiper belt from the sun?
If the angular speed of the earth becomes 17 times its present value what will be the 1) effect on a body on the equator of the earth? A) Heavier than the present value B) lighter than the present A satellite is 200 miles above the earth. It has a mass of 150 kg. ...
Again, because of the equatorial bulge, the planet's diameter is slightly smaller when measured from pole to pole, where it is about 7,900 miles (12,712 km). The equatorial circumference of Earth is 24,901 miles (40,075 km). However, from the North Pole to the South Pole, the so-...
"To obtain an idea of the size of a light-year, take the circumference of the Earth (24,900 miles), lay it out in a straight line, multiply the length of the line by 7.5 (the corresponding distance is one light-second), then place 31.6 million similar lines end to end," NASA's ...
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...
It could fly a total of 10,000 nautical miles—almost half the earth’s circumference—with just one midair refueling. One drawback to the flying-wing design is that it makes the plane unstable and hard to pilot. But the advent of fly-by-wire controls in the 1940s that regulate an ...
Earth is the fifth largest planet in the Solar System and has a circumference of 40,070 km (24,898 miles) according to measurements by orbiting spacecraft. Its radius is 6,378 km (3,963 miles), making its diameter 12,756 km (7,926 miles). Image of Earth captured during Apollo 10,...