site.btaRozhen Astronomical Observatory to Have Open-Door Day on Sunday
![Rozhen Astronomical Observatory to Have Open-Door Day on Sunday](/upload/356892/578462_490464194346370_398140571_n.jpg?l=1000)
![Rozhen Astronomical Observatory to Have Open-Door Day on Sunday](/upload/356892/578462_490464194346370_398140571_n.jpg?l=1000&original=45cc33fa7db56d0db12bc2f9a477b73249a6493e)
The annual open-door day at the Rozhen National Astronomical Observatory (NAO) with the Institute of Astronomy at the Bulgarian Academy of Sciences (BAS) will take place on Sunday, coinciding with the Christian holiday of Pentecost this year.
/DT/
news.modal.header
news.modal.text