Plonsk observatory

Plonsk observatory traces its roots to 1877, when amateur astronomer Jan Walery Jędrzejewicz built one of Poland's earliest private observatories in the town of Płońsk.

About Plonsk observatory

The original observatory was founded in 1877 by Jan Walery Jędrzejewicz (1835–1887), an amateur astronomer who used it to track double stars, sunspots, lunar occultations and comet positions - recording measurements for 16 different comets during his lifetime.

History

Jędrzejewicz's instruments were relocated to Warsaw in 1899, and his historic work laid the foundation for astronomy in Płońsk. Local enthusiasm was revived with the founding of the Płońsk Association of Astronomy Enthusiasts in 2008, which led to the opening of a new facility - the Jan Walery Jędrzejewicz Planetarium and Astronomical Observatory - in 2024, named in his honour.

Location & getting there

Płońsk is a town in the Masovian Voivodeship of Poland, roughly between Warsaw and Płock - an easy day trip from the Polish capital.

Visiting Plonsk observatory

The modern Jan Walery Jędrzejewicz Planetarium and Astronomical Observatory opened in 2024 and runs public programming carried forward by the Płońsk Association of Astronomy Enthusiasts. Check the current schedule before visiting, as planetarium and observatory hours can vary.

See your named star from here

Jędrzejewicz spent decades charting comets and double stars by eye and by instrument - the same kind of careful looking you can do with a named star. If you've named one through Star Register, bring its coordinates to the observatory, or browse the full star catalogue to see what else is visible from Płońsk.