Here's a short story:

Greenwich is on the River, five miles from the middle of London, and its history is two thousand years old. The first English people were fishermen there, and they named the place Greenwich, meaning "green village". Later the English kings and queens lived at Greenwich in their beautiful places. 

The name of the earliest palace was Placentia. Henry VIII lived there. He knew that England must be strong at sea. So he started two big ship-yards at Greenwich. But trouble was coming to Greenwich. In 1649, a war started in England and for eleven years there was no king. The men who had worked for him at Placentia decided to live the place themselves. They sold all its beautiful things. Finally, the war ended and King Charles II came back. But Placentia was falling down. So King Charles built a new and bigger palace, which is now open to the public. 

At this time, Charles was worried about losing so many of its ships at sea: their sailors did not know how to tell exactly where they were. So in 1675, Charles made John Flamsteed, the first astronomer in England, try to find the answer. Flamsteed worked in a new building on the high ground in Greenwich Park. From it with a telescope which he made himself, Flamsteed could look all round the sky. And he did, night after night, for twenty years. Carrying on Flamsteed's work a hundred years later, an astronomer called Harrison finally made a clock which told the time at sea, and helped sailors to know where they were. You can see Harrison's clock, still working, in Greenwich's museum of the sea. Because of Flamsteed's work, every country in the world now tells its time by Greenwich Time. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: how far from London is Greenwich?
Guess: five miles

Question: Does it have a meaning?
Guess: meaning "green village"

Question: who built the ports?
Guess: Henry VIII

Question: did he have a house there?
Guess: yes

Question: named what?
Guess: Placentia

Question: where is the clock now?
Guess: n Greenwich's museum of the sea

Question: when did the war start?
Guess: In 1649

Question: how old is Greenwhich's history?
Guess: two thousand years old

Question: who made the telescope?
Guess: Flamsteed

Question: why did he make it?
Guess: look at round the sky

Question: who made the clock?
Guess: Harrison

Question: what happened to everything in Placentia?
Guess: it was destroyed

Question: by who?
Guess: the war

Question: who appointed Flamsteed?
Guess: Charles

Question: Did King Charles make a new house?
Guess: yes

Question: where did Flamsteed work?
Guess: Flamsteed worked in a new building on the high ground in Greenwich Park

Question: for how long?
Guess: for twenty years

Question: Did the clock help?
Guess: yes

Question: who did it help?
Guess: helped sailors

Now answer the following question in the same format.

Question: how?

to know where they were