Eise Jeltes Eisinga (Dronrijp, 21 February 1744 - Franeker, 27 August 1828) was a Dutch amateur astronomer who built an orrery in his house in Franeker, Netherlands. The orrery still exists and is the oldest in the world. Menaldumadeel is a municipality in the northern Netherlands. ... February 21 is the 52nd day of the year in the Gregorian Calendar. ... // Events The third French and Indian War, known as King Georges War, breaks out at Port Royal, Nova Scotia The First Saudi State founded by Mohammed Ibn Saud Prague occupied by Prussian armies Ongoing events War of the Austrian Succession (1740-1748) Births January 10 - Thomas Mifflin, fifth President... Franeker (Frisian: Frjentsjer) is one of the eleven cities of Friesland. ... August 27 is the 239th day of the year in the Gregorian Calendar (240th in leap years), with 126 days remaining. ... 1828 was a leap year starting on Tuesday (see link for calendar). ... A small orrery showing earth and the inner planets An orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the solar system in heliocentric model. ...

Introduction

Eisinga was the son of a wool comber. Although he was moderately gifted, he wasn’t allowed to go to school. When he was only 17 he published a book regarding the principles of astronomy. Eisinga became a wool comber in Franeker, Netherlands, and educated himself in mathematics and astronomy through self-education and at the Franeker Academy. At the age of 24 he married Pietje Jacobs (? – 24th July 1788) and they had three children, one girl and two boys. This article needs to be cleaned up to conform to a higher standard of quality. ... (Redirected from 24th July) July 24 is the 205th day (206th in leap years) of the year in the Gregorian Calendar, with 160 days remaining. ... 1788 was a leap year starting on Tuesday (see link for calendar). ...

• Trijntje (April 1773 – 26 April 1773)
• Jelte (29 May 1774 – 31 March 1809)
• Jacobus (17 March 1784 – 24 March 1858)

Due to a political crisis in 1787, he had to leave Friesland and went to Germany. Later he moved to Visvliet where he worked as a wool comber. He was banned from Friesland for five years and therefore stayed in Visvliet. Meanwhile his wife died, and on 27 May 1792 he married Trijntje Eelkes Sikkema (21 February 1764) in Visvliet. They had one son and two daughters. 1773 was a common year starting on Friday (see link for calendar). ... April 26 is the 116th day of the year in the Gregorian Calendar (117th in leap years). ... 1773 was a common year starting on Friday (see link for calendar). ... May 29 is the 149th day of the year in the Gregorian calendar (150th in leap years). ... Chesma Column in Tsarskoe Selo, commemorating the end of the Russo-Turkish War. ... March 31 is the 90th day of the year in the Gregorian Calendar (91st in leap years), with 275 days remaining. ... Year 1809 (MDCCCIX) was a common year starting on Sunday (link will display the full calendar). ... March 17 is the 76th day of the year in the Gregorian Calendar (77th in leap years). ... 1784 was a leap year starting on Thursday (see link for calendar). ... March 24 is the 83rd day of the year in the Gregorian Calendar (84th in leap years). ... 1858 (MDCCCLVIII) is a common year starting on Friday of the Gregorian calendar (or a common year starting on Sunday of the 12-day-slower Julian calendar). ... May 27 is the 147th day (148th in leap years) of the year in the Gregorian calendar, with 218 days remaining. ... 1792 was a leap year starting on Sunday (see link for calendar). ... February 21 is the 52nd day of the year in the Gregorian Calendar. ... 1764 was a leap year starting on Sunday (see link for calendar). ...

• Eelke (14 October 1793 – 28 May 1795)
• Hittje (16 February 1796 – 8 May 1843)
• Minke (4 June 1798 – 17 July 1870)

In 1795 he returned to Franeker. Eisinga became a professor at the Franeker Academy, until in 1811 Napoleon ordered it to be closed. Eisinga died on 27 August 1828, at the age 84. October 14 is the 287th day of the year (288th in leap years) in the Gregorian calendar. ... 1793 was a common year starting on Tuesday (see link for calendar). ... May 28 is the 148th day of the year in the Gregorian calendar (149th in leap years). ... 1795 was a common year starting on Thursday (see link for calendar). ... February 16 is the 47th day of the year in the Gregorian Calendar. ... Year 1796 (MDCCXCVI) was a leap year starting on Friday (link will display the full calendar) of the Gregorian calendar (or a leap year starting on Monday of the 11-day slower Julian calendar). ... May 8 is the 128th day of the year in the Gregorian Calendar (129th in leap years). ... 1843 was a common year starting on Sunday (see link for calendar). ... June 4 is the 155th day of the year in the Gregorian calendar (156th in leap years), with 210 days remaining. ... 1798 was a common year starting on Monday (see link for calendar). ... July 17 is the 198th day (199th in leap years) of the year in the Gregorian calendar, with 167 days remaining. ... 1870 (MDCCCLXX) was a common year starting on Saturday (see link for calendar) of the Gregorian calendar or a common year starting on Monday of the 12-day-slower Julian calendar. ... August 27 is the 239th day of the year in the Gregorian Calendar (240th in leap years), with 126 days remaining. ... 1828 was a leap year starting on Tuesday (see link for calendar). ...

Orrery

On 8 May 1774 a conjunction of the moon and the planets Mercury, Venus, Mars, Jupiter would appear, Reverend Eelco Alta, from Bozum, Netherlands, published a book in which he predicted that the planets and the moon would collide, with the result that the earth would be pushed out of its orbit and burned by the sun. Due to this prediction there was a lot of panic in Friesland. To prove that there was no reason for panic, Eisinga decided to build an orrery in his living room. He expected to finish it within six months and eventually finished it in 1781, 7 years after he started. During the same year Uranus was discovered, but for this planet there was no room on the ceiling of his livingroom, where there orrery was located. May 8 is the 128th day of the year in the Gregorian Calendar (129th in leap years). ... Chesma Column in Tsarskoe Selo, commemorating the end of the Russo-Turkish War. ...

On 30 June 1818 King Willem I and Prince Frederik visited the orrery. King Willem I bought the orrery for the Dutch state. In 1859 the orrery was donated by the Dutch state to the city of Franeker. In Eisinga's the working of the orrery was described. June 30 is the 181st day of the year (182nd in leap years) in the Gregorian Calendar, with 184 days remaining. ... 1818 (MDCCCXVIII) is a common year starting on Thursday of the Gregorian calendar or a common year starting on Saturday of the 12-day slower Julian calendar. ...

External links

• Planetary Eise Eisinga