n the 200s BC, Eratosthenes figured out a very clever method for measuring the size of the Earth. He heard about a well in Syene (in modern Egypt) where the sunshine reached the bottom only at noon in the summer solstice. So he knew exactly when the sun was directly overhead. Further north in Alexandria he put a stick straight up in the ground and measured the angle of its shadow at that precise moment as 7.2°. It meant that the distance from Syene to Alexandria was 7.2/360 of the Earth's circumference. Since he knew this distance, he could compute the circumference as 39250km, a diameter of about 12500km.n the 200s BC, Eratosthenes figured out a very clever method for measuring the size of the Earth. He heard about a well in Syene (in modern Egypt) where the sunshine reached the bottom only at noon in the summer solstice. So he knew exactly when the sun was directly overhead. Further north in Alexandria he put a stick straight up in the ground and measured the angle of its shadow at that precise moment as 7.2°. It meant that the distance from Syene to Alexandria was 7.2/360 of the Earth's circumference. Since he knew this distance, he could compute the circumference as 39250km, a diameter of about 12500km.
The earth's circumference is calculated by measuring the distance around the world at the equator.
Earth circumference can be approximated by taking earth's radius (6378 km) and multiplying by 2 pi, which gives 40,074 km. This is approximate because earth is not a perfect sphere.
Earth is not a perfect circle or sphere, and therefore does not have a set and unique circumference all the way round.
However, approximations through a single plane of the earth can be found by measuring angles and calculating from distances; for example, Eratosthenes estimated the circumference through Syene and Alexandria, by measuring the angles of parallel posts and knowing the distance between them. When one post has no shadow (and is "at vertical" the other has a shadow at an angle). By using the ration of this angle to the whole circle, you can figure the whole circumference from the section distance.
The name of the person to first do this has been lost to antiquity. It happened more than once, however. Many different cultures and civilizations had people who figured out how long it took the earth to orbit the sun. They did this by noting how long it took the constellations to return to their annual positions. There are ancient astronomical observatories in a number of locations around the world. The Egyptians were famous for building structures that could be used for this purpose. Stone Henge, in England, is an observatory. There are also stone piles in South America that were most likely used for astronomical observations.
Eratosthenes was able to calculate the approximate circumference of the earth. The difference in the angle between two cities along a curve. He multiplied the distance enough to equal 360 degrees. This made the circumference of the earth. But, of course it would be slightly off.
Eratosthenes was the first person to nearly correct the measurement of the earths
circumference.
Eratosthenes of Cyrene (Greek 276 BC
Eratosthenes
It can determine that the constellation has a certsain amount of connected stars
nobody
We can calculate it by applying Newton's version of Kepler's third law with Earth's orbital period (1 year) and Earth's average distance from the Sun (1 AU).
To determine a star's luminosity is from size and temperature.
The sun does not determine the shadow, the object that stops its light does.
State the problem: How can we prove Earth is round and calculate its circumference? Make a hypothesis: If the sun casts shadows at different angles at the same time of day in different places, we can determine how much Earth curves. Make observations and collect data: In Syene, the sun's rays are vertical at noon. At the same time in Alexandria, the rays are 7.2 degrees from the vertical.
He postulated the circumference of the earth.
using a telescope to determine the coordinates of a star
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.
Isacc Newton
use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference
Your question presumes that tree trunks are all circular. If you happen to find a circular tree trunk, you would measure around it to find the circumference. If the tree trunk is not circular, you will not be able to find the circumference but, you can measure around it to determine its perimeter.
To determine the circumference of any circle, multiply the diameter by pi. Pi is approximately equal to 3.1416
the question: a cylindrical tank has a circumference of 13.2, determine the diameter and the cross-sectional area of the tank?
Measure the length around the roll.
How? They are synonymous. Circumference is the measurement around an object. Perimeter is the edge around an object.Try it like this:To determine the perimeter of a circle, you multiply the radius by two and then multiply that by pi.2rπTo determine the circumference of a circle, you multiply the radius by two and then multiply that by pi.2rπThe same.
The most reliable way to determine if a customer is intoxicated is to observe their behavior for signs such as slurred speech, unsteady movements, and impaired judgment. Physical signs are more reliable indicators than subjective assessments or assumptions.