Neptune

eighth and farthest planet from the Sun in the Solar System, mainly composed of ice and rock

11 dated entries naming Neptune, drawn from 11 separate years between 1483 CE and 2011 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

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15th century

1483April 30 – Pluto moves inside Neptune's orbit until July 23, 1503, according to modern orbital calculations. At the time, neither planet has been discovered by Earth astronomers. The event of Pluto being closer to the Sun than Neptune will happen again during the period lasting from 1979 to 1999.source

16th century

1503July 23 – Orbital calculations suggest that on this day Pluto moves outside Neptune's orbit, remaining there for 233 years.source

17th century

1612December 28 – Galileo Galilei becomes the first astronomer to observe the planet Neptune when in conjunction with Jupiter. He mistakenly catalogues it as a fixed star, because of its extremely slow motion along the ecliptic. Neptune will not be truly recognized as a planet until 1846, about 234 years later, when Johann Gottfried Galle first sights it in the Berlin Observatory.source

18th century

1702September 19 – Jupiter occults Neptune.source

19th century

1846October 1 – Triton, Neptune's largest moon, is discovered by William Lassell 17 days after the discovery of Neptune.source

20th century

1949May 1 – Nereid, a moon of Neptune, is discovered by Gerard Kuiper.source
1979February 7 – Pluto moves inside Neptune's orbit for the first time since either was known to science.source
1983June 13 – Pioneer 10 passes the orbit of Neptune, becoming the first human-made object to leave the vicinity of the major planets of the Solar System.source
1989August 25 – Voyager 2 makes its closest approach to Neptune and its largest moon Triton.source
1999February 11 – Pluto moves along its eccentric orbit further from the Sun than Neptune. It had been nearer than Neptune since 1979, and will become again in 2231.source

21st century

2011July 12 – The planet Neptune completes its first orbit since it was discovered in 1846.source