Palermo : Italy
At the turn of the 21st century, Palermo is still struggling to recover from the devastation of World War II and the damage caused by decades of uncontrolled urban growth. The historic city centre is still partly in ruins, the traffic is horrific, and poverty is widespread. Being the city in which the Italian Mafia historically had its main interests, it has also been the place of several recent well-publicized murders.
Palermo is a city with monumental problems, but is also a city of almost three millennia of history, beautiful palaces and churches, colourful markets, marvelous food and a distinctive cultural identity.
Historical population
1800: 202,800 inhabitants
1830: 171,100
1850: 178,900
1880: 236,300
1900: 295,600
1925: 416,500
2000: 675,000
Interesting Sights
The Cathedral has a heliometer (solar “observatory”) of 1690, one of a number1 built in Italy in the 17th and 18th centuries. The device itself is quite simple: a tiny hole in one of the minor domes acts as Pinhole camera, projecting an image of the sun onto the floor at solar noon (12:00 in winter, 13:00 in summer). There is a bronze line, la Meridiana on the floor, running precisely N/S. The ends of the line mark the positions as at the summer and winter solstices; signs of the zodiac show the various other dates throughout the year.
The purpose of the instrument was to standardise the measurement of time and the calendar. The convention in Sicily had been that the (24 hour) day was measured from the moment of sun-rise, which of course meant that no two locations had the same time and, more importantly, did not have the same time as in St. Peter’s Basilica in Rome. It was also important to know when the Vernal Equinox occurred, to provide the correct date for Easter.
The “solar clock” can be up to 16 minutes fast or slow. The reason for this is explained fully in Main Articles Analemma and Equation of time, but can be summarised thus: the earth rotates on its axis every 24 hours but it also orbits the sun. Thus the sun will appear directly over the same spot increasingly early (or late) each day. The correct track to draw on the ground is a figure 8 rather than a line.
