The "heart" of the Planetarium is the round star hall, which is 15m in diameter and has 150 seats. In the center of the hall is situated the main projector - "Cosmic Flight Planetarium", which has been produced by Carl Zeiss Jena, Germany. It creates artificial starry sky, which is a copy of the real sky.
It also reproduces the motions of the heavenly bodies - the Sun, the Moon and the planets, solar and lunar eclipses, star rain, aurora borealis. . . It imitates a flight in the space and carries us into other worlds and other times. . .
The spacious central foyer is used as an exhibition area. There is a permanent exhibition of fantastic paintings, as well as temporary thematic exhibitions.
Under the 3-meter dome of the Planetarium observatory, there is installed 15-cm telescope reflector Cassegrain system.
In clearly weather, the visitors can observe the Sun and the active areas of the solar photosphere - during the day; the Moon, planets, binary stars, star clusters, nebulas - during the night.
In the library of the Planetarium there are more than 5000 publications in Bulgarian as well as different foreign languages, most of them related to astronomy.
On the astro ground in front of the Planetarium there is a gnomon and a sundial, as well as a platfor for observations, on which small telescopes can be installed.
The gnomon is a simple ancient astronomical instrument for measuring the position - altitude and direction, of the Sun.
A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating the hours of the day. As the sun moves across the sky, the shadow-edge progressively aligns with different hour-lines on the plate.
The Planetarium has a conference hall with 200 seats, suitable for holding different kinds of events, which can be rented.
There is access for people with disabilities