Use the motorway A 656, exit Heidelberg - Mitte. On the A 6, orientate yourself at the Mannheimer Kreuz, on the A 5 at the Heidelberger Kreuz onto the A 656 towards Heidelberg. Directly after the motorway exit, follow Bergheimer Straße to Bismarckplatz, turn right and follow the signs for Schloss and Königsstuhl. At the crossroads at the top of the mountain follow the signs to the Max Planck Institute for Astronomy. The MPIA's rolling gate is open on weekdays from 6:30 to 18:45.