Eclipse observers often face unexpected difficulties, sometimes on their way to their chosen sites and sometimes at a site itself.
Among the more interesting challenges are those that tested 19th-century French astronomer Jules Janssen.
Puzzled by Mysteries
Janssen was 35 years old when he turned his attention to the mysteries of the Sun. He had many questions. Among them were: What precisely was Earth’s star made of? and What caused it to give off certain rays? Janssen did much of his work from observatories using a spectroscope that he constructed. This device can determine what things are made of. It works by spreading out light into the rainbow of colors. Many spectroscopes make that rainbow by passing the light through a prism .Since gases of different elements make or take up different precise colors, studying the bright or dark lines we see in the spectroscope enables us to identify elements even as far away as the stars.
この記事は Dig Into History Magazine for Kids and Teens の January 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です ? サインイン
この記事は Dig Into History Magazine for Kids and Teens の January 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
Worshiping Heaven
For almost 500 years, emperors of the Ming and Qing dynasties offered sacrifices and prayers at the Temple of Heaven in Beijing.
Peace Reigns
The news spread throughout Egypt—a new pharaoh, Ramses III, now sat on the throne.
Problems To The East
Ramses III, the second king of Egypt’s 20th Dynasty, is viewed as Egypt’s last truly great pharaoh.
The Successors
Following the death of Ramses III, eight pharaohs, all named Ramses, ruled Egypt.
Stone Code
Hundreds of ships, led by the French general Napoleon Bonaparte, sailed from France in May 1798 on a secret mission.
Up & Away!
Eclipse observers often face unexpected difficulties, sometimes on their way to their chosen sites and sometimes at a site itself.
Edison's Eclipse Adventure
Thomas Edison (1847–1931) is the best-known inventor in American history.
Digging Up Copernicus
The scientist “who made the Earth a planet” is how the Harvard-Smithsonian astronomer Owen Gingerich refers to Nicolaus Copernicus (1473–1543). Copernicus’ path breaking book, On the Revolutions of the Heavenly Spheres,challenged the centuries-old belief that the Earth stood stationary at the center of the cosmos.
Demosthenes & Cicero
Even today, more than 2,000 years after they lived, Demosthenes and Cicero are still considered two of history’s most outstanding orators.
Confucius & Socrates
Some teachers are so inspirational that their influence lives on long after they die.
