Join us at the Open Day on Ocotber 28! 15 October 2018

On Sunday 28 October, the annual open day of the Old Observatory in Leiden takes place. During this day everyone can visit the Old Observatory for free and enjoy activities in this historic building.

Celebrating the International Day of Light in the Old Observatory 06 June 2018

On 16 May the first International Day of Light was celebrated all around the globe. Initiated by UNESCO, organisations in 87 different countries set up a total of more than 600 events to embrace the vital role of light and related technologies in science. In the Old Observatory in Leiden visitors could learn more about light by doing their own experiments.

120-year-old telescope back after maintenence 28 February 2018

After a period of maintenance, the 'Photographer' telescope is available once again for visits at the Old Observatory.

The Kaiser Spring Lectures are about to start! 01 February 2018

The program for the Kaiser Spring Lectures 2018 has been published! Visit the Old Observatory in March for four amazing lectures about the Space Age.

A 120 year-old Telescope Gets a Makeover 31 August 2017

For the first time more than half century, one of oldest telescopes at Leiden Observatory is getting a major improvement.