The observatory is considered a paving stone for Athens. It is located across from the Parthenon in the Acropolis, and was used for astronomical and metrological research in Greece. Today the observatory includes the astronomical museum of the city. Displayed here for the wider audience are an astronomical clock, telescope, a library, and tools used by astronomers in the 19th century.
The new observatory replaced the ancient observatory that was built in the city in the 5th century, in a straight line with the metrological tower called the Tower of the Winds, and is located in the area of the metro stop Heliotropion, whose name means "Turned towards the sun."