Fabricius, Johann

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Fabricius, Johann Gender: M
Johannes Fabricius
born on 8 January 1587 Jul.Cal. (18 Jan 1587 greg.) at 11:00 (= 11:00 AM )
Place Dornumersiel, Germany, 53n40, 7e28
Timezone LMT m7e28 (is local mean time)
Data source
Rodden Rating B
Collector: Scholfield
Astrology data s_su.18.gif s_capcol.18.gif 27°54' s_mo.18.gif s_taucol.18.gif 14°58 Asc.s_taucol.18.gif 00°46'

Johann Fabricius (Monument to David and Johann Fabricius in the cemetery of Osteel)
photo: Matthias Süßen, license gfdl


Frisian-German astronomer, eldest son of David Fabricius (1564–1617), with whom he was co-discoverer of sunspots (in 1610), independently of Galileo Galilei.

He studied at the University of Helmstedt, Wittenberg University and graduated from Leiden University in 1611. He returned from university in the Netherlands with telescopes that he and his father turned on the Sun. Despite the difficulties of observing the sun directly, they noted the existence of sunspots, the first confirmed instance of their observation (though unclear statements in East Asian annals suggest that Chinese and Korean astronomers may have discovered them with the naked eye previously, and Fabricius may have noticed them himself without a telescope a few years before). Johannes first observed a sunspot on 27 February 1611.

The pair soon used camera obscura telescopy so as to save their eyes and get a better view of the solar disk, and observed that the spots moved. They would appear on the eastern edge of the disk, steadily move to the western edge, disappear, then reappear at the east again after the same amount of time that it had taken for it to cross the disk in the first place.

He died in Marienhafe on 19 March 1616, at the age of 29.

Link to Wikipedia biography


  • child->parent relationship with Fabricius, David (born 9 March 1564 Jul.Cal. (19 Mar 1564 greg.))


  • Death, Cause unspecified 19 March 1616 (greg.) (Age 29)
    chart Placidus Equal_H.

Source Notes

Sy Scholfield quotes from the book Abhandlungen, Volume 10 (Naturwissenschaftlichen Verein zu Bremen., 1889), p. 262: "Johann Fabricius wurde am 8. Januar 1587 an einem Sonntage, vormittags 11 Uhr zu Resterhafe geboren, „cui Spiritu S. adsit deus aeternus"." Translation: Johannes Fabricius was born on 8 January 1587 on a Sunday morning at 11:00 o'clock at Resterhafe. NB: This date Old Style was a Sunday.


  • Personal : Death : Short Life less than 29 Yrs (Age 29)
  • Vocation : Science : Astronomy
  • Notable : Famous : First in Field (Co-invented camera obscura telescopy)
  • Notable : Famous : First in Field (Co-discovered sunspots)