how did eratosthenes estimate the size of earth in 240 b.c.?

Answers

Answer 1

Answer:In 240 BC, how did Eratosthenes calculate the size of the earth? Using simple trigonometry, we compared whether daylight could reach water in water wells in two cities at different latitudes. The earth's system to set and a line that connects the globe to the sun are perpindicular on the spring equinox.

Explanation:

In 240 B.C., the Greek astronomer Eratosthenes made the first good measurement of the size of Earth. By noting the angles of shadows in two cities on the Summer Solstice, and by performing the right calculations using his knowledge of geometry and the distance between the cities, Eratosthenes was able to make a remarkably accurate calculation of the circumference of Earth. Let's take a closer look at how he did it!

Eratosthenes lived in the city of Alexandria, near the mouth of the Nile River by the Mediterranean coast, in northern Egypt. He knew that on a certain day each year, the Summer Solstice, in the town of Syene in southern Egypt, there was no shadow at the bottom of a well. He realized that this meant the Sun was directly overhead in Syene at noon on that day each year.

Eratosthenes knew that the Sun was never directly overhead, even on the Summer Solstice, in his home city of Alexandria, which is further north than Syene. He realized that he could determine how far away from directly overhead the Sun was in Alexandria by measuring the angle formed by a shadow from a vertical object. He measured the length of the shadow of a tall tower in Alexandria, and used simple geometry to calculate the angle between the shadow and the vertical tower. This angle turned out to be about 7.2 degrees.


Related Questions

2. Explain Thomas Hobbes' point of view concerning the rights of man.

Answers

Answer:

He argued that the essential natural (human) right was “to use his own power, as he will himself for the preservation of his own Nature that is to say of his own Life"

Explanation:

when did the starbucks reserve roastery in chicago open

Answers

Answer: Nov 15, 2019

Explanation:

what of the following characterized ghana after 1992?

Answers

Answer:  Advances in education and human services.

Explanation:

why does the author say yawning is contagious​

Answers

Answer:

because a lot of times when 1 person yawns most people around them do

Explanation:

The author says yawning is contagious​ because People yawn after seeing others yawn.

Who is the author?

A literary work's creator (such as a book) a well-known author is someone who makes or originates anything, such as a software developer or a screenwriter. A writer is someone whose writing has been made public. People who write are considered writers when they create the concepts and content of their writing.

One study found that yawning is six times more likely to occur after witnessing someone else yawn. Regarding the spread of yawns, Giordano suggested that it might be connected to a process known as social mirroring, in which living things imitate the behaviors of others.

Therefore, Thus option (C) is correct.

Learn more about The author here:

https://brainly.com/question/9260046

#SPJ2

Why were the Europeans interested in colonizing east africa

Answers

Answer:

ano ba answer jan pakopya thanks

In 1795, the Cape Colony became a British colony, before it was returned to the Dutch in 1802. During this first period of British rule, South-East Africa became the main source of slaves. ... The main purpose of these expeditions was to trade slaves.

Help me please What regions of Afroeurasia were directly linked by the Silk Road around 300 C.E.?
0
Select all correct answers.
India
O Middle East
China
Europe

Answers

The Silk Road passed through China and went to Europe. I don’t think it was south enough to hit the Middle East or India.

The area, which is directly linked by the Silk Road around 300 C.E were china to Europe and Middle East. Thus option second, third and fourth are correct.

What was the silk route?

The silk route was the ancient passage meant for the trading activity that connected China with the West, moving commodities and ideas between Rome and China.

Wool, gold, and silver migrated east, while silk traveled west. Nestorian Christianity and Buddhism were also transported to China through the Silk Road from India.

It is a historic economic network that connected China and the Far East to Europe and the Middle East. The route had a number of trade facilities and markets that assisted in goods storage, transit, and exchange. It was also known as the Silk Road.

Therefore, it can be concluded that option second, third and fourth are correct.

Learn more about the silk route here:

https://brainly.com/question/21390529

#SPJ2

What do most colonists think about the Stanp act?

Answers

Answer:    The American colonists were angered by the Stamp Act and quickly acted to oppose it. Because of the colonies' sheer distance from London, the epicenter of British politics, a direct appeal to Parliament was almost impossible. Instead, the colonists made clear their opposition by simply refusing to pay the tax.

Explanation:

What is Caribbean government like????

Answers

Answer:

I don't know much about it but I do know that its a parliamentary democracy

Explanation:

2. What was the
purpose of intendants?

Answers

Answer: Intendants purpose was to be responsible for supplies, finances, etc. on the battle field.

Explanation: I hope this helps :) You've got this!

How would you describe a third party today?

Answers

A third party are in the shadows and not many people know about third parties. And usually it’s just the two big candidates that get the spotlight. The also the reason why they don’t get many votes.

which amendment decided that a person could be president for only two terms

Answers

Answer: the 22nd amendment did

Explanation: it says "No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once."

smaller scale paintings of middle-class interiors were typical in which country during the renaissance?

Answers

The French painters used the smaller scale paintings of middle-class interiors during the renaissance period.

The smaller scale painting are called the miniatures painting and the painting technique was introduced in France in 17th century which was perfected by Jean Petito.

Miniature paintings includes colorful handmade paintings which are very small in size.

The outstanding features of the painting is the use of intricate brushwork which contributes to their unique identity.

Therefore, the French painters used the smaller scale painting of middle-class interiors during the renaissance period.

Read more about this here

brainly.com/question/783040

does the welland canal have locks? how do u know?

Answers

Answer:8 locks along the canal with 7 located in the northern half

Explanation:

he Welland Canal connects Lake Ontario (at Port Weller) to Lake Erie (at Port Colbourne). The canal is 26 mi/42 km in length. The present canal is the fourth one to be constructed. There are

Prior to becoming President of the U.S., Herbert Hoover ______

Answers

Answer:

Hoover would serve as secretary of commerce from 1921 to 1929 under Harding

Explanation:

True or false the father reaches of a country settlement are called a buffer

Answers

Answer:

Meaning of Buffer

Explanation:

buff·er

/ˈbəfər/

noun

a person or thing that prevents incompatible or antagonistic people or things from coming into contact with or harming each other.

"family and friends can provide a buffer against stress"

synonyms: cushion, bulwark, shield, screen, barrier, guard, safeguard, hedge, shock absorber, armor, intermediary, middleman, go-between

a solution that resists changes in pH when acid or alkali is added to it. Buffers typically involve a weak acid or alkali together with one of its salts.

a temporary memory area in which data is stored while it is being processed or transferred, especially one used while streaming video or downloading audio.

"print speed is boosted by pages being formatted in a buffer while another is printing"

verb

lessen or moderate the impact of (something).

"the massage helped to buffer the strain"

synonyms: cushion, absorb, soften, lessen, diminish, moderate, mitigate, allay, deaden, muffle, stifle, shield

treat with a chemical buffer.

"add organic matter to buffer the resulting alkalinity"

store (data) in a buffer while it is being processed or transferred.

"try buffering as much of the video stream as you can before you hit the 'play' button"

Definitely its False

What did the Druids build to honor Samhain?

Answers

Answer:

To celebrate Samhain the Druids built huge sacred bonfires. People brought harvest food and sacrificed animals to share a communal dinner in celebration of the festival. During the celebration the Celts wore costumes - usually animal heads and skins. They would also try and tell each other's fortunes

Explanation:

explanation


Which of the following is not a potential problem of using more nuclear
energy?
O A. Most nuclear plants can only operate for 30 - 40 years.
B. Cost to build a nuclear plant is very high
C. Spent nuclear fuel is dangerous if handled wrong
D. The cost of nuclear fuel is very low

Answers

Answer:

a

Explanation:

just beacuse i know tis A

Answer:

The cost of nuclear fuel is very low

13. Immigrants experienced all of the following when they arrived in America EXCEPT

Help please

Answers

D. Harsh questions at Ellis Islands Angels Island

austria hungary took over this balkan state in 1908

Answers

Answer:

took over Bosnia and Herzegovina in 1908

Explanation:

The annexation of Bosnia and Herzegovina by Austria-Hungary in October, 1908.

Why did the Assyrians borrow from other cultures in the creation and development of their empire ?give at least two reasons

Answers

Despite their fearsome reputation, the Assyrians embraced civilization. They wrote using cuneiform and decorated their cities liberally with reliefs, painted stonework, and sculpture.

help me find this question

Answers

Answer: I think it's C

Explanation:

There's no mention of slavery or the Women's Suffrage Movement, and from analyzing the text you can tell that it's about government.

what is the longest an astronaut has stayed in space

Answers

Answer: 437 Days

Explanation: Valeri Polyakov spent 437 days on the Mir space station from 1994 and 1995 .

What is something that prevents people from voting in elections?

Answers

Answer:

Explanation:

Abstention is a term in election procedure for when a participant in a vote either does not go to vote (on election day) or, in parliamentary procedure, is present during the vote, but does not cast a ballot. ... White votes, however, may be counted in the total of votes, depending on the legislation.

Explain the journalistic style of Mark

Answers

Answer:

It's kind of hard without know what mark your taliking about

Explanation:

Which statement is an idea in the Declaration of Independence?

Answers

Answer:

The Declaration of Independence included these three major ideas: People have certain Inalienable Rights including Life, Liberty and Pursuit of Happiness. All Men are created equal. Individuals have a civic duty to defend these rights for themselves and others.

Why is it hard for Single Issue minor parties to gain support?

Answers

Answer:

  Because adults or older people look down on minors/kids due to the fact that they are younger then them and they see them as weak and all of the above. So due to that when a minor needs affection or support in general form time to time they may act fake or put a fake face on. So for example you may see minor who made a channel like TommyInnit, Ran boo, and Tubbo they didn't get help starting there channels now tommy has 11 millions followers, Tubbo has 2 million followers, and has more on streaming site, same with Ranboo he has 2 million and much much more on twitch. So, thats a little message for any minors to never give up.

707/36 estimated in two ways

Answers

19.638

38 is reapeating

and 19 23/26

DESPERATE WILL GIVE BRAINLIST AND THANKS FOR THE CORRECT ANSWER!!!!
Which of the following is the BEST definition of the Social Gospel movement?

A.It was the belief that if everyone converted to Christianity then problems would disappear.

B.It is the idea that the strongest businesses would thrive while the weak would not, much like "survival of the fittest" in nature.

C.It was a Christian's duty to improve society and help the poor and people in need.

D.Socialism should be implemented to help the poorest members of society.

Answers

I’m pretty sure it’s C.

WILL MARK BRAINLIEST!!!!


What events caused the disunity of Italy again?

Answers

Answer:

The revolutions of 1848 ignited nationalist sentiment throughout the Italian peninsula. The Franco-Austrian War of 1859 was the agent that began the physical process of Italian unification. The Austrians were defeated by the French and Piedmont at Magenta and Solferino, and thus relinquished Lombardy.

Explanation:

Which was a political benefit of British rule in India?


freedom of speech

loans for railways

resuscitation of India’s noble literature

telegraphs

Answers

Answer: B.) Loans for Railways

Explanation:

Other Questions
4. A desk with a mass of 10 kg is pushed across a floor with an acceleration of 4 m/s?. Whatis the force on the desk? Use the equation F = ma. What was Duncanson stimuli for painting The Land of the Lotus Eaters? a neutral atom of astatine would have how many electrons? For the sake of rhetorical flourish, the author wants to use the same word as two different partsof speech. Which choice best accomplishes this goal?She did not hate many things, although she disliked the very act of hating things.ANO CHANGE3Balthough she hated that emotion.:except for that very emotion....D..except for hate itself. $200 is divided in the ratio 6: 4, What is the smaller part? lim(x1)(1-x)/(x^2-1) Thirty percent of all telephones of a certain type are submitted for service while under warranty. Of these, 70% can be repaired, whereas the other 30% must be replaced with new units. If a company purchases ten of these telephones, what is the probability that exactly four will end up being replaced under warranty Evaluate -8x+5-2x-4+5x Once upon a time there was kingdom near a lake then one day the lake dried up so they went to the king and said in hasnt rained in such a long time and our field are barren said the farmers Theres no fish so are we supposed to make a living said the fishermen and the women asked to saved the citizens from the disaster As their children needed water then the king told his 4 generals to look for water and the generals went in all directions looking for water And the 3 generals quit but the general that went north didnt quit because he didnt want to let his village down and the found mountain ranges before finding a cold village then as he sat on a rock an old lady from the villages sat on a rock then he told the lady that hes from a kingdom that didnt rain for as year and he asked her where he can find Water then the lady tells him to follow her to a cave And the ladys country is also suffering a drought an that these icicles Have water then the general breaks a huge piece And took it home and it melt into a small piece of lump by the time he got back And everyone was amazed because they havent seen ice before and believed it was a seed so they dug a hole to plant it and by the time they put the ice on the ground it vanished So they dug deeper and deeper into the earth looking for the ice all night long By the time dawn break the king saw the farmers fast asleep and was curious on what they did And was amazed to see ground water believing the seed sprouted And called everyone to see water in the hole thats basically the story on how the first well was created 1.0286 as a fraction what effort is made in nepal for the conservation of wildlife? The coming together of two terrestrial plates can change ecosystems byA) decreasing the gene pool as different species of animals and plants to interbreedB) introducing new species between previously-separated land masses, altering existing food chainsC) creating new habitats for land animals that fill niches at lower altitudes and warmer temperaturesD) increasing the area of the shoreline, providing more habitats for marine life that need greater sunlight Evaluate the expression 6^2-(84^2+7 what is one third of 16 create 3 food chain with these fish,seaweed,eagle,lion,mango,monkey,banana, parrot,snake,cow,crocodile 5.) Dynasti works in a department store selling clothes. She makes a guaranteed salary of$1250 per week and is paid a commission of 15% of her sales. Write an equation to model thesituationHow much money will Dynasti make if she sells $4,000 worth of clothing? 1. What part of Mother Teresa's life touched you? Why?2. What are your realizations after reading or watching the video about her life?3. How can you apply them in your day-to-day living? Whats the greatest common factor of (280, 168) What occurs along a convergent plate boundary?earthquakes and volcanoesvolcanoes and ridgeshot spots and ridgesearthquakes and hot spotsOi please hurry Compare and contrast positive and negative spaces of an artwork. What is one thing that makes them different from each other?