Showing posts with label Julius Caesar. Show all posts
Showing posts with label Julius Caesar. Show all posts

Tuesday, March 1, 2016

The Leap Day That Wasn't

Bernard of Botone (d.1266) gloss on Leap Day
Most of you know that Julius Caesar in the 1st century BCE wanted to fix the fact that solstices and equinoxes were "sliding" from their original locations in the calendar, due to the fact that Earth's orbit around the Sun did not take place in an even 365 days. The extra six hours meant that, every four years, the calendar was "off" by an entire day. "Everyone knows" that the extra day was added to the end of February, creating February 29th every four years.

Except it wasn't.

Truth is, it just wasn't that simple. The standard Roman year at the time of Julius was 355 days. A "intercalary month" was added every three years or so to even things out and restore some normalcy to the spacing of festivals. The new year started on 1 March, and so the "extra month," which was called Mercedonius, was inserted prior to 1 March.

But that would throw things off even more—adding that month made those years 377-8 days long. So that the year would not get too long, they shortened February to just a little over three weeks. A year that needed Mercedonius had a February that ended on the 23rd. Why the 23rd? because that was Terminalia, the festival of Terminus, god of boundaries, and therefore a fitting end to the month.

Julius realized that this was a mess of overcorrecting for the astronomical inequality, and so he demanded that his scholars figure out what the calendar needed. They shifted some months, rewarded him for his wisdom by naming the seventh month after him, and told him the calendar could be kept stable by adding a single day every 4th year.

But where to add it?

Well, since inserting a correction in February was already a common practice, why not there? Excellent! So it was added—right after the day after Terminalia. There was no interest, however, in giving this new day its own identity—after all, it was only going to be around every four years, so who would count on it? Therefore, instead of calling it 24 February, they called it bis septum [Latin: "twice sixth"] because 24 February would have been the sixth day before the Kalends of March, so they would simply have 24th February repeated.

Therefore, even after the Leap Day was introduced into February, there was no 29 February until the Middle Ages, with the widespread European adoption of a sequential system of numbering, rather than counting forward and backward from the Ides and Kalends of the Roman system.

Tuesday, January 1, 2013

The New Year

Tying the start of a year to the season of spring makes perfect sense in agrarian cultures. The Romans started their year in spring for a long time, seeing March 25th as a logical "New Year's Day" because the days were clearly getting longer after that date.

The reason why they (and we) use the 25th of certain months instead of the 21st (when astronomically significant events like solstices and equinoxes take place), is because 4 days was the length of time it took for an observer without instruments to be certain that the seasons were, in fact, changing.

When Julius Caesar decided to reform the calendar in 45 BCE (adding a "leap day) each four years), he chose to start his new version on January 1. Named for Janus, the duo-visaged god of transitions and beginnings, it made sense to start a significant change at the start of his month. Friends would create good omens for the start of the year by giving each other token gifts of figs and honey, and wishing each other well for the coming year.

In the Middle Ages, the Church preferred to use a date of greater religious significance (Christian religion, that is, rather than Roman). March 25th (as The Annunciation) was sometimes used, and December 25th as Christmas, and March 1st (for convenience, since it could start a month and a year).

When Pope Gregory XIII reformed the calendar again,* he chose January 1st to be the official start of the year. He didn't cause the whole world to follow his lead. Most European countries had already settled on the "Julian solution" for the first day of the year.

Happy New Year.

*Technically, when he carried out the reforms planned by Pope Paul III.

Monday, September 17, 2012

Got Silk?

Silk was not a medieval invention. According to Chinese tradition, Empress Si-Ling-Chi in 2460 BCE watched silkworms spinning cocoons; she unwound several cocoons, then ran the strands together to make thread, then wove the result into cloth to make a robe for Emperor Huang-Ti.

The Silk Road routes
Unverifiable, but it may very well be true. What is slightly more historically documented is that China guarded the secret of this magnificent fabric for centuries, but was willing to manufacture the cloth and sell it for very high prices to others. Wealthy people from other countries would gladly pay large sums to purchase it—soft and smooth, light to wear, dyed easily—so knowledge of this material spread. India somehow figured out the secret and was manufacturing its own silk by the 2nd century CE.

Ezekiel mentions silk, which means it was known to the Middle East in the 6th century BCE. Aristotle mentions the process of dealing with the cocoons, but the knowledge must have been lost for awhile, because it seems to be a mystery to that part of the world centuries later. We are told that Julius Caesar (100-15 March 44 BCE) had silk curtains. It is thought that the Romans first encountered silk in the hands of the Parthians in the first century BCE. By the end of the 1st century CE, Rome was trading for silk with the Parthians; we don't know what kind of "mark up" the Parthians were putting on the silk that they got from the East, but it was probably substantial. Although more than silk was traded between the East and West, silk was one of the few things only available from the Far East, and so the collection of interconnected trade routes from China and India to Byzantium and Alexandria became known as the "Silk Road."

Of course, it is cheaper to manage production yourself, and the Byzantine scholar Procopius (500-565 CE) tells us how some Nestorian monks* gave the Emperor Justinian the secret: the thread comes from silkworms that could not survive transportation, but their cocoons would travel well if insulated in dung and fed on mulberry leaves when hatched. Byzantium created a thriving silk industry and supplied Europe for centuries. The silk factories were staffed by all-female crews, and so were called gynaecea—after the name given to the section of a Roman or Greek home devoted to women.

Marco Polo on the Silk Road
The cycle of industrial espionage continued, however, when Muslims, who learned the secret of silk when they conquered Persia, took over Sicily and Spain. By the 13th century, Europe was producing its own silk and purchasing less from Byzantium. By the 15th century, France had its own factories. This was necessary, according to Louis XI, because purchasing silk from Italy created a trade deficit for France of 40-50,000,000 gold écus.**

Silk is different from cotton or wool in that it is not spun; rather, two or more strands are twisted together. To produce this, new techniques were invented. The simple reel is said to have been first devised for holding strands of silk, which could be up to a mile long. Two reels would be set up to unwind simultaneously so that their strands could be twisted together in a technique called "throwing."

The Middle Ages loved silk so much that a whole new vocabulary was created to describe its uses in fabrics:
  • alexander - a striped silk
  • baldachin - a warp of gold thread with a woof of silk
  • begin - 14th century rayed silk fabric
  • camlet - half silk/half hair (such as angora)
  • cendal - woven silk material
  • ecarlate - high-quality silk
  • gauze - semi-transparent silk (from 13th century onward)
  • imperial - silk with gold thread; originally from Byzantium, later called baldachin
  • osterni - silk dyed purple
  • samite - silk with interwoven gold or silver threads
  • sarcenet - thin soft silk with slight sheen; sometimes called "shot"
  • tartaire - silk from Tartary
...and in all these centuries, it hasn't lost its luster.

*Remember the Nestorians? They were a branch of Christianity deemed heretical a century before Procopius, who made their home in the East where William Rubruck ran into them.
**Story of the Silk Road by Yiping Zhang, p.146 (I don't normally bog things down with citations—I assume you trust me!—but this number was so ... impressive that I felt the need to point to a source. It may be a huge exaggeration.