This great set of sundials is located in a little park next to Puerta de Toledo of Madrid. It was designed by Alberto Corazón from the astronomical calculations made by Juan José Caurcel. It was built in 1988 and the Council restored it in 2005. In fact there are six different sundials in this structure:
For example, you can see a polar dial on the top of the ‘box’ of the next picture and a lunar dial on its front. In the first one you can read the equation of time from 21st Junt to 21st December meanwhile the second is for determining the night hours in the six days after the Full Moon (the two dials in the left part of the structure are complementary to these ones!).
Regrettably, Spain is in a very deep economic crisis (although Spanish prime minister always says that everything is going to be OK!) and the space for equatorial and the vertical dials are occupied by homeless who don’t agree the prime minister’s optimism.
Location: Puerta de Toledo in Madrid (map)