If you were to start at a certain spot on the equator and go around the world on the equator to the same spot. How many miles would it be? thanks if anybody knows.
2007-02-24 17:02:16 · 9 answers · asked by Rob 2 in Science & Mathematics ➔ Geography
if we measure the circumference of the earth at the equator, it is 24,901.55 miles (40,075.16 kilometers).
But, if it is measured through the poles, the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is wider than it is tall. This shape is known as an ellipsoid or more properly, geoid (earth-like).
Eratosthenes calculated the Earth's circumference circa 240 BC (he was the first one to do it), using trigonometry and knowledge of the angle of elevation of the Sun at noon in Alexandria and Syene (now Aswan, Egypt). The calculation is based on the assumption that the Earth is spherical and that the Sun is so far away that its rays can be taken as parallel. He knew the approximate distance between Syene and Alexandria, as measured by camel-powered trade caravans. He then measured the angle of the shadow in Alexandria on the solstice. By taking the angle of the shadow (7°12') and dividing it into the 360 degrees of a circle (360 divided by 7.2 yields 50), Eratosthenes could then multiply the distance between Alexandria and Syene by 50 to determine the circumference. He calculated it as 25000 miles!
2007-02-24 17:28:37 · answer #1 · answered by Anonymous · 2⤊ 0⤋
About 360 x 69 miles (I'm leaving off the decimals)
degrees in a circle x miles per degree of longitude at the equator (the fattest part of the earth)
2007-02-24 17:23:08 · answer #2 · answered by Jennifer B 3 · 0⤊ 0⤋
equatorial 24,901.55 miles (40,075 km)
Other EARTH numbers:
Mean radius: 6,372.797 km
Equatorial radius: 6,378.137 km
Polar radius: 6,356.752 km
Aspect Ratio: 0.996 647 1
Equatorial circumference: 40,075.02 km
Meridional circumference: 40,007.86 km
Mean circumference: 40,041.47 km
Surface area: 510,065,600 km²
Land area: 148,939,100 km² (29.2 %)
Water area: 361,126,400 km² (70.8 %)
The average depth of the oceans is 3,794 m (12,447 ft), more than five times the average height of the continents
Depth Layer
Kilometres Miles
0–60 0–37 Lithosphere (locally varies between 5 and 200 km)
0–35 0–22 ... Crust (locally varies between 5 and 70 km)
35–60 22–37 ... Uppermost part of mantle
35–2890 22–1790 Mantle
100–700 62–435 ... Asthenosphere
2890–5100 1790–3160 Outer core
5100–6378 3160–3954 Inner core
2007-02-25 02:21:49 · answer #3 · answered by dark_one 2 · 0⤊ 0⤋
Go to the website listed below to learn the circumference of the earth.
2007-02-24 17:17:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Approximately 24,900 miles at the equator.
2007-02-24 17:22:15 · answer #5 · answered by Ryan M 1 · 0⤊ 0⤋
The circumference of the earth is approx. 40,080km.
2007-02-28 01:52:41 · answer #6 · answered by Anonymous · 0⤊ 0⤋
I believe someone said it was about 24,000 miles circurmference.
2007-02-28 11:54:32 · answer #7 · answered by Sasha 4 · 0⤊ 0⤋
Do you mean, "What is the circumference of the earth?
It is 40,076km.
2007-02-24 18:45:54 · answer #8 · answered by RUDOLPH M 4 · 0⤊ 0⤋
roughly 25k miles
2007-02-25 02:19:52 · answer #9 · answered by Anonymous · 0⤊ 0⤋