m
milkyway

Sep 29

English

1 min read

Mapmaking

This post is a continuation from yesterday.

Tadataka Ino was originally a merchant, but after he turned 50, he started studying astronomy in earnest.
On his observing the North Star, he noticed that the height of the Pole Star was different when he observed it at his house and when he observed it at his teacher's house.
Based on that, he calculated the diameter of the Earth.
His teacher pointed out that the error should be large because the distance is short. So he wanted to go around Hokkaido.
However, at that time, ordinary people were not allowed to travel freely.
Therefore, Mr. Ino promised the government to mapmaking, and he was allowed to go to travel.
He made a lot of astronomical observations on his way mapmaking.
Then he calculated the diameter of the Earth again.
The calculation results are quite accurate compared to the current ones.
Tadataka Ino is famous for mapmaking by walking all over Japan in Edo period.
But It is very interesting for me that his real passion was astronomy.

伊能忠敬は、元々商人でしたが、50歳を過ぎてから趣味の天文学を本格的に学び始めました。
彼の家で観測した時と先生の家で観測した時で北極星の高さが違う事に気づきました。そしてそのことから地球の直径を計算しました。
先生に距離が短いので誤差が大きいはずだと指摘され、遠くへ行って観測する事を考えました。
しかし、その頃は一般人が自由に旅行することは許されていませんでした。
そこで、伊能は、日本地図を作って政府に献上することを約束して、旅に行く許可を得ました。彼は旅の途中で沢山の天文観測を行いました。
そして、再び地球の直径の計算をしました。それは現代の計算と比較してもかなり正確なものだそうです。
伊能忠敬は、日本中を歩いて地図を作ったことで有名ですが、彼の本当の情熱は天文学にあったということが、私にはとても面白く感じます。

Corrections (2)

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Showing corrections grouped by sentence
2

This post is a continuation from yesterday.

2

Tadataka Ino was originally a merchant, but after he turned 50, he started studying astronomy in earnest.

On his observing the North Star, he noticed that the height of the Pole Star was different when he observed it at his house and when he observed it at his teacher's house.

On his observing the North Star, he noticed that the height of the Pole Star was different when he observed it at his house thand when he observed it at his teacher's house.

On his observing the North Star, he noticed that the height of the PoleNorth Star was different when he observed it at his house andcompared to when he observed it at his teacher's house.

I think North Star and Pole Star both refer to the same star? So maybe choose one so it's not confusing.
Stylistic
2

Based on that, he calculated the diameter of the Earth.

1

His teacher pointed out that the error should be large because the distance is short.

His teacher pointed out that the calculation error shwould be largconsiderable because of the short distance is shortnvolved.

Stylistic

So he wanted to go around Hokkaido.

So he wanted to goBecause of this, he wanted to make observations from all around Hokkaido.

So he wanted to go aroundtravel to Hokkaido.

1

However, at that time, ordinary people were not allowed to travel freely.

However, aAt that time, however, ordinary people were not allowed to travel freely.

Therefore, Mr. Ino promised the government to mapmaking, and he was allowed to go to travel.

Therefore, Mr. Ino promised the government to mapmaking, andhat he'd make maps for them and then he was allowed to go to travel.

Therefore, Mr. Ino promised the government to mapmakinghat he would make maps, and he was allowed to go to travel.

Grammar

He made a lot of astronomical observations on his way mapmaking.

He made a lot of astronomical observations on his wayduring his mapmaking.

He made a lot of astronomical observations on his way mapmakingtravels.

Probably don't need to mention map making again, as it's implied by the previous sentence.
Grammar Stylistic
2

Then he calculated the diameter of the Earth again.

1

The calculation results are quite accurate compared to the current ones.

The calculationed results awere quite accurate compared to the currentexisting ones.

Tadataka Ino is famous for mapmaking by walking all over Japan in Edo period.

Tadataka Ino is famous for mapmaking byecause he walking ed all over Japan induring the Edo period.

Tadataka Ino is famous for mapmaking bythe maps he produced whilst walking all over Japan in the Edo period.

Grammar Stylistic
1

But It is very interesting for me that his real passion was astronomy.

But It is very interesting for me, however, that his real passion was astronomy.

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milkyway

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