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53 years
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Heinrich Louis d'Arrest was a German astronomer, born in Berlin. While still a student at the University of Berlin, d'Arrest was party to Johann Gottfried Galle's search for Neptune. On September 23, 1846, he suggested that a recently drawn chart of the sky, in the region of Urbain Le Verrier's predicted location, could be compared with the current sky to seek the displacement characteristic of a planet, as opposed to a stationary star. Neptune was discovered that very night. D'Arrest's later work at the Leipzig Observatory led him, in 1851, to the discovery of the comet named for him (formally designated 6P/d'Arrest). He also studied asteroids (he discovered 76 Freia) and nebulae. The crater D'Arrest on the Moon is named after him, as well as a crater on the Martian satellite Phobos and the asteroid 9133 d'Arrest....
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Heinrich Louis d'Arrest was a German astronomer, born in Berlin. While still a student at the University of Berlin, d'Arrest was party to Johann Gottfried Galle's search for Neptune. On September 23, 1846, he suggested that a recently drawn chart of the sky, in the region of Urbain Le Verrier's predicted location, could be compared with the current sky to seek the displacement characteristic of a planet, as opposed to a stationary star. Neptune was discovered that very night. D'Arrest's later work at the Leipzig Observatory led him, in 1851, to the discovery of the comet named for him (formally designated 6P/d'Arrest). He also studied asteroids (he discovered 76 Freia) and nebulae. The crater D'Arrest on the Moon is named after him, as well as a crater on the Martian satellite Phobos and the asteroid 9133 d'Arrest....
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The Universe
The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The majority of matter and energy is most likely... |
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Neptune, 8th Planet from the Sun
Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus.
In Roman mythology Neptune (Greek: Poseidon) was the god of the Sea.
After the discovery of Uranus,... |
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Le Verrier, Co-discovery of Neptune
Urbain Jean Joseph Le Verrier was a French mathematician who, beginning in 1838, studied the causes of perturbations in the Solar System. His work led to improved knowledge of the masses of the planets, the scale of the Solar System, and the velocity... |
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Galle, Discovery Neptune - 1846
Johann Gottfried Galle was a German astronomer at the Berlin Observatory who, with the assistance of student Heinrich Louis d'Arrest, was the first person to view the planet Neptune, and know what he was looking at, on 23 September, 1846. He used the... |
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John Adams, Predicted Neptune - 1841
John Adams was an English mathematician and astronomer who predicted the existence of Neptune. While a student at Cambridge he wrote this note (found only after his death) dated Jul. 3, 1841: Formed a design at the beginning of this week of investiga... |
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