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Walking Tours of Rome

1582 & the Missing Ten Days!

4/10/2023

 
Tower of the Winds (Torre dei Venti), Vatican City
Tower of the Winds (Torre dei Venti), Vatican City

October 4th 1582 was the last day of the Julian calendar. The next day the Gregorian calendar came into effect and ten days were omitted to make the adjustment from the old to the new. October 4th was therefore followed by October 15th!

The Gregorian calendar is named after Pope Gregory XIII (r. 1572-85). His funerary monument in St Peter's Basilica makes reference to his reformation of the calendar. 


The old calendar, which aligned the civil year more closely to the astronomical year, was introduced by Julius Caesar on January 1st 46 BCE. In the Julian calendar, each year had 365 days, and an extra day was added every 4 years to make up for the six-hour difference between the civil and the solar year.

The Julian calendar was a great improvement on what had gone before, but it had one fundamental flaw, it fell short 12 minutes each year. Over the years the missing minutes added up and by the beginning of the 4th century the spring equinox, which the Julian calendar had set at March 24th, was falling on March 21st. This was to have significant implications for the celebration of Easter, the most important feast in the Christian year. 

In 325 the Council of Nicaea set the date on which Easter was to be celebrated as the first Sunday after the first full moon after the spring equinox. As the centuries passed, the date of the spring equinox fell back further and further; by the start of Gregory XIII's reign, it was falling on March 11th. The pope decided to act and appointed a special commission of experts to devise a system which would correct the error of the Julian calendar. 

On February 24th, 1582, Pope Gregory XIII issued the bull Inter Gravissimas, whereby the new calendar was to be put into effect. In addition to fine tuning leap years*, the bull also decreed that the ten days from October 5th to October 14th were to be eliminated, in order to offset the shift of the spring equinox.

​The Gregorian calendar came into force in Italy, France, Spain, Portugal and Poland on October 15th, 1582. However, it was not accepted by Protestant nations until the 18th century. 

*Aloysius Lilius (c.1510-76), the brains behind the Gregorian calendar, came up with the idea of adding an extra day in years divisible by 4, unless the year is also divisible by 100. If the year is also divisible by 400, an extra day is added, regardless.

Sadly, Lilius's ingenious method of aligning the civil and solar years is not perfect and the system is still off by 26 seconds. As a result, the Gregorian calendar will be a full day ahead of the solar year in 4909. ​

​The Torre dei Venti (Tower of Winds) was expressly built to determine the extent of the inaccuracy of the Julian calendar. The eagle-eyed may spot a dragon atop the tower. (A dragon makes up the coat of arms of the Buoncompagni family, to which Pope Gregory XIII belonged.) 


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    My name is David Lown and I am an art historian from Cambridge, England. Since 2001 I have lived in Italy, where I run private walking tours of Rome.

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    • S. Alessio
    • S. Anastasia al Palatino
    • S. Andrea al Quirinale
    • S. Andrea della Valle
    • S. Andrea delle Fratte
    • S. Angelo in Pescheria
    • S. Anna dei Palafrenieri
    • S. Antonio dei Portoghesi
    • S. Apollinare
    • Ss. Apostoli
    • S. Balbina
    • S. Barbara dei Librai
    • S. Bartolomeo all' Isola
    • S. Benedetto in Piscinula
    • S. Bernardo alle Terme
    • S. Bibiana
    • S. Brigida
    • S. Carlo ai Catinari
    • S. Carlo al Corso
    • S. Carlo alle Quattro Fontane
    • S. Caterina a Magnanopoli
    • S. Caterina dei Funari
    • S. Caterina da Siena
    • S. Cecilia in Trastevere
    • Ss. Celso e Giuliano
    • S. M. in Monticelli
    • Ss. Claudio e Andrea
    • S. Clemente >
      • Cappella Castiglione
    • Ss. Cosma e Damiano
    • S. Crisogono
    • S. Costanza
    • S. Croce in Gerusalemme >
      • Chapel of St Helen
    • Ss. Domenico e Sisto
    • S. Dorotea
    • S. Eusebio
    • S. Eustachio
    • S. Francesco a Ripa >
      • Cappella Altieri
      • Cappella Rospigliosi-Pallavicini
    • S. Francesca Romana
    • S. Giacomo degli Spagnoli
    • S. Giorgio in Velabro
    • S. Giovanni a Porta Latina
    • S. Giovanni Decollato
    • S. Giovanni dei Fiorentini
    • S. Giovanni della Pigna
    • Ss. Giovanni e Paolo
    • S. Giovanni in Laterano >
      • Cappella Corsini
      • Cappella Lancellotti
    • S. Girolamo dei Croati
    • S. Girolamo della Carità >
      • Cappella Antamoro
      • Cappella Spada
    • S. Giuliano dei Fiamminghi
    • S. Giuseppe dei Falegnami
    • S. Gregorio Magno
    • S. Ignazio di Loyola
    • S. Ivo alla Sapienza
    • S. Lorenzo fuori le Mura
    • S. Lorenzo in Damaso
    • S. Lorenzo in Lucina
    • S. Lorenzo in Miranda
    • S. Lucia del Gonfalone
    • S. Luigi dei Francesi >
      • Cappella Contarelli
    • Ss. Luca e Martina
    • Ss. Marcellino e Pietro
    • S. Marcello al Corso
    • S. Marco
    • S. Maria ad Martyres
    • S. Maria ai Monti
    • S. Maria Annunziata
    • S. Maria degli Angeli
    • S. Maria dei Miracoli
    • S. Maria della Concezione
    • S. Maria del Popolo >
      • Cappella Cerasi
      • Cappella Chigi
    • S. Maria dei Sette Dolori
    • S. Maria del Priorato
    • S. Maria della Consolazione
    • S. Maria della Pace >
      • Chigi Chapel
      • Cloister of Bramante
    • S. Maria della Scala
    • S. Maria della Vittoria >
      • Cappella Cornaro
    • S. Maria delle Grazie
    • S. Maria dell' Anima
    • S. Maria dell' Orazione e Morte
    • S. Maria dell' Orto
    • S. Maria di Loreto
    • S. Maria in Aracoeli >
      • Cappella Bufalini
    • S. Maria in Aquiro
    • S. Maria in Campitelli
    • S. Maria in Cosmedin
    • S. Maria in Domnica
    • S. Maria in Monserrato
    • S. Maria in Montesanto
    • S. Maria in Traspontina
    • S. Maria in Trastevere >
      • Cappella Altemps
    • S. Maria in Trivio
    • S. Maria in Via
    • S. Maria in Via Lata
    • S. Maria Maddalena
    • S. Maria Maggiore >
      • Baptistery
      • Cappella Paolina
      • Cappella Sistina
    • S. Maria sopra Minerva >
      • Cappella Carafa
      • Chapel of the Annunciation
    • S. Maria Scala Coeli
    • S. Martino ai Monti
    • Ss. Nereo e Achilleo
    • S. Nicola da Tolentino
    • S. Nicola dei Lorenesi
    • S. Nicola in Carcere
    • Ss. Nome di Maria
    • S. Onofrio al Gianicolo
    • S. Pancrazio
    • S. Pantaleo
    • S. Paolo alla Regola
    • S. Paolo alle Tre Fontane
    • S. Paolo fuori le Mura
    • S. Pasquale Baylon
    • S. Pietro in Montorio
    • S. Pietro in Vincoli
    • S. Prassede
    • S. Prisca
    • S. Pudenziana
    • Ss. Quattro Coronati
    • S. Rita da Cascia
    • S. Rocco
    • S. Saba
    • S. Sabina >
      • Chapel of St Catherine
      • Chapel of St Hyacinth
    • S. Salvatore in Lauro
    • S. Salvatore in Onda
    • S. Sebastiano fuori le Mura >
      • Cappella Albani
    • S. Silvestro in Capite
    • S. Sisto Vecchio
    • S. Spirito in Sassia
    • S. Stanislao dei Polacchi
    • S. Stefano Rotondo
    • Ss Stimmate di San Francesco
    • Ss. Sudario dei Piemontesi
    • S. Susanna
    • Ss. Trinità degli Spagnoli
    • Ss. Trinità dei Pellegrini
    • Ss. Trinità di Monti
    • Ss. Vincenzo e Anastasio
    • Ss. Vincenzo e Anastasio
    • S. Vitale
  • Cloisters
  • Palatine
  • Forum
    • Arch of Septimius Severus
    • Arch of Titus
    • Basilica of Maxentius
    • Curia Julia
    • Temple of Antoninus Pius
    • Temple of Castor and Pollux
    • Temple of Saturn
    • Temple of Venus and Rome
    • Temple of Vespasian and Titus
    • Temple of Vesta
  • Ancient Monuments
    • Aqueducts
    • Ara Pacis
    • Arch of Constantine
    • Arch of Drusus
    • Arch of Gallienus
    • Arch of Janus
    • Arch of the Money-Changers
    • Aurelian Walls
    • Baths of Caracalla
    • Baths of Diocletian
    • Castel Sant' Angelo
    • Catacombs of Domitilla
    • Circus Maxentius
    • Circus Maximus
    • Colosseum
    • Column of Marcus Aurelius
    • Column of Trajan
    • Forum of Augustus
    • Forum of Trajan
    • Mausoleum of Augustus
    • Nymphaeum
    • Pantheon
    • Ponte Fabricio
    • Ponte Milvio
    • Ponte Rotto
    • Ponte Sant' Angelo
    • Porta Maggiore
    • Porta San Paolo
    • Porta San Sebastiano
    • Portico of Octavia
    • Pyramid of Cestius
    • Temple of Hadrian
    • Temple of Hercules
    • Temple of Jupiter
    • Temple of Portunus
    • Theatre of Balbus
    • Theatre of Marcellus
    • Theatre of Pompey
    • Tomb of Caecilia Metella
    • Via Appia
  • Obelisks
    • 'Minerveo' Obelisk
    • 'Flaminio' Obelisk
    • 'Matteiano' Obelisk
    • 'Lateran' Obelisk
    • 'Dogali' Obelisk
    • 'Macuteo' Obelisk
    • 'Solare' Obelisk
    • 'Vatican' Obelisk
    • 'Agonalis' Obelisk
    • 'Sallustiano' Obelisk
    • 'Quirinale' Obelisk
    • 'Esquiline' Obelisk
    • 'Pinciano' Obelisk
    • 'Mediceo' Obelisk
    • 'Torlonia' Obelisks
    • 'Mussolini' Obelisk
    • 'Marconi' Obelisk
  • Mosaics
    • Sant' Agnese fuori le Mura
    • Santa Cecilia in Trastevere
    • San Clemente
    • Santa Costanza
    • Santa Francesca Romana
    • San Lorenzo fuori le Mura
    • San Marco
    • Santa Maria in Domnica
    • Santa Maria in Trastevere
    • Santa Maria Maggiore
    • Santa Prassede >
      • San Zenone
    • Santa Pudenziana
    • Santo Stefano Rotondo
    • San Teodoro
    • San Venanzio
    • Santi Cosma e Damiano
    • Santi Nereo e Achilleo
  • Palaces
    • Palazzo Barberini
    • Palazzo dei Conservatori
    • Palazzo del Quirinale
    • Palazzo della Cancelleria
    • Palazzo della Consulta
    • Palazzo delle Esposizioni
    • Palazzo Farnese
    • Palazzo Farnesina
    • Palazzo di Giustizia
    • Palazzo Laterano
    • Palazzo Madama
    • Palazzo Spada
    • Palazzo Venezia
    • Palazzo Zuccari
    • Villa Giulia
    • Villa Farnesina
    • Villa Medici
  • Galleries & Museums
    • Baths of Diocletian
    • Capitoline Museums
    • Etruscan Museum
    • Galleria Borghese
    • Galleria Colonna
    • Galleria Doria-Pamphilj
    • Palazzo Altemps
    • Palazzo Massimo
  • Piazzas
    • Campo de' Fiori
    • Piazza Augusto Imperatore
    • Piazza dei Cavalieri di Malta
    • Piazza del Campidoglio
    • Piazza del Popolo
    • Piazza del Quirinale
    • Piazza della Repubblica
    • Piazza Farnese
    • Piazza Navona
    • Piazza Vittorio Emanuele II
  • Miscellaneous
    • A Calendar of Saints
    • A Literary Tour of Rome
    • Antico Caffè Greco
    • Babington's Tea Rooms
    • Barberini Bees
    • Borromini & the Baroque
    • Catacombs
    • Column of the Immaculate Conception
    • Domes
    • Equestrian Statues
    • EUR >
      • Museum of Roman Civilisation
    • Fasces
    • Flood Plaques
    • Galleria Sciarra
    • House of the Owls
    • Jewish Ghetto
    • Knights of Malta
    • Mithraism
    • Monumental Complex of S. Spirito in Sassia
    • Nolli Map of Rome
    • Ponte Sisto
    • Porta Pia
    • 'Protestant' Cemetery
    • Quartiere Coppedè
    • Scala Santa
    • Spanish Steps
    • Street Shrines
    • 'Talking' Palaces
    • 'Talking' Statues
    • Tiber Island
    • Views of Rome
    • Villa Borghese
    • Vittoriano
  • On This Day in Italy
    • January
    • February
    • March
    • April
    • May
    • June
    • July
    • August
    • September
    • October
    • November
    • December
  • The Bernini Trail
  • Baroque Sculptors
    • Alessandro Algardi
    • Pietro Bracci
    • Ercole Ferrata
    • Domenico Guidi
    • Pierre Le Gros
    • Giuseppe Mazzuoli
    • Antonio Raggi
    • Camillo Rusconi
    • Filippo della Valle
  • Florence
    • A Literary Tour
    • Anna Maria Luisa: Last of the Medici
    • Canons' Palace
    • Casa-Galleria Vichi
    • Column of Justice
    • Column of St Zenobius
    • Cosimo I de' Medici
    • Cosimo II de' Medici
    • Costanza Bonarelli
    • David With Fig Leaf
    • Elizabeth Barrett Browning
    • Equestrian Statue of Cosimo I de' Medici
    • Equestrian Statue of Ferdinando I de' Medici
    • Festina Lente
    • Flood Plaques
    • Fontana del Bacchino
    • Fontana dei Puttini
    • Fountain of Neptune
    • Fountains of the Marine Monsters
    • Gian Gastone de' Medici
    • Girolamo Savonarola
    • Images of the Annunciation
    • Little Devil
    • Monument to Cellini
    • Palazzo Bartolini-Salimbeni
    • Palazzo Bianca Cappello
    • Palazzo Fenzi
    • Palazzo Viviani
    • Perseus and Medusa
    • Piazza Santa Maria Novella
    • Pope Leo XI
    • Porta della Mandorla
    • Rape of the Sabine Woman
    • Santa Maria Novella
    • Statue of Dante
    • Theft of the Century
    • Torre del Arnolfo
    • Twelve Good Men
    • Villa Gamberaia
    • Wheel of the Innocents
    • 'Wine Windows'
  • Lazio
    • Bomarzo: Parco dei Mostri
    • Viterbo: Santa Rosa
  • Tuscany
    • Arezzo: Giorgio Vasari
    • Lucca: Puccini
    • Pistoia: Ospedale del Ceppo
    • Siena: The Balzana
    • Siena: The Palio
  • Venice
    • 421: Foundation of Venice
    • Acqua Alta
    • Bartolomeo Colleoni
    • Barque of Dante
    • Caffè Florian
    • Daniele Manin
    • Flagpoles
    • Giustina Rossi
    • Gondolas
    • Harry's Bar
    • Henry James
    • House of Three Eyes
    • Island of Lace
    • King Victor Emmanuel II
    • Map of Venice
    • Martinmas
    • Master of the House
    • Palazzo Contarini Fasan
    • Ponte Borgoloco
    • Ponte Chiodo
    • Punta del Dogana
    • Scacciadiavoli
    • Shrine of St Lucia
    • Sior Antonio Rioba
    • The 'Book Shitter'
    • The Lion's Mouth
    • Tommaso Rangone
    • Torcello
    • Venus
    • 'Viennese Oranges'
    • Wellheads
    • Winged Lions