Happy New (Chinese) Year!

On Sunday, Feb. 14, while we were observing Valentine’s Day, a much bigger celebration got underway in the Far East.  That was the  Chinese New Year, the day when the Year of the Ox ended and the Year of the Tiger began.  And the celebration is still ongoing, as it lasts until the Lantern Festival on the 15th day of the month (this year, Feb. 28).

Creative Commons License photo credit: ken2754@Yokohama

Like most Americans, I learned the sky as imagined by westerners around the Mediterranean basin, with images from Babylon, ancient Egypt, ancient Greece and Rome, and star names preserved during the Middle Ages by Arabs. So I find it fascinating to think of an entirely different culture and how they imagined the night sky. The Chinese New Year celebration is a perfectly appropriate time to do this, especially since objects in the sky, in particular the moon and Jupiter, serve as the basis of the ancient Chinese calendar.

The date of Chinese New Year varies; it can occur as early as Jan. 21 or as late as Feb. 19. However, anyone familiar with the lunar cycle can easily predict the date for a given year. That’s because China’s New Year always begins with the second new moon after the winter solstice.

Our Gregorian calendar is a solar calendar, based on the apparent position of the sun (and thus, on the Earth’s orbit around the sun).  However, the apparent position of the sun compared to the stars is difficult to observe.  Much more readily observable are the phases of the moon.  Thus the Chinese, like many ancient cultures, adopted a lunar calendar, measuring months from new moon to new moon.  Unlike the Islamic or ancient Roman calendars, the Chinese calendar begins months with the dark of the moon–the day the moon is invisible, not the first slender crescent seen at dusk.

Full Moon
Creative Commons License photo credit: Andréia

It would be convenient if one year equaled an even number of phase cycles. In fact, however, the moon takes about 29.5 days to go through one phase cycle, so 12 such cycles is 354 days.  This is significantly less than the solar year of 365.25 days, so a purely lunar calendar quickly becomes disconnected from the seasons and useless as a guide for when to plant or harvest.   To keep their lunar months connected with the seasons, the Chinese added a rule: the second-to-last lunar month must contain the winter solstice.  If the old crescent moon of the eleventh lunar month is waning towards new and the winter solstice has not yet happened, that month is repeated.  Similar rules exist for the second lunar month (which must contain the spring equinox), the fifth lunar month (which must contain the summer solstice), and the eighth lunar month (which must contain the fall equinox).  Accordingly, the first new moon after the winter solstice always begins the last month in the Chinese year, and the second new moon after the solstice begins the next year.

Chinese astronomers noticed that every twelve years, Jupiter reappears next to the same stars.   (This is because Jupiter takes 11.86 years to orbit the Sun.)  There were twelve months in a typical Chinese year (although occasionally one was doubled, as explained above).  Also, the Chinese divided the day into twelve double-hours.  They used a system of twelve ‘Earthly Branches’ to designate the months of the year and the double-hours in a day.  Jupiter’s motion in the sky established a cycle of years analogous to the cycles of months and double-hours.  Thus Jupiter became the ‘Year Star’ (Suixing) and years, too, were designated with the Earthly Branches.

Lion Dance
Creative Commons License photo credit: geoftheref

Later, as a mnemonic device, the Chinese began to associate the Earthly branches with animals.  (Sources disagree as to exactly when.)  Legends tell that Buddha (or the Jade Emperor) summoned all of the animals to him; each of the first twelve to appear became associated with an Earthly Branch.  The twelve animals are:

1) Rat  2) Ox  3) Tiger  4) Rabbit  5)Dragon  6)Snake  7)Horse  8)Sheep  9)Monkey  10)Rooster  11)Dog  12)Pig

The signs of the Chinese zodiac, then, unlike those of the western zodiac, are not constellations in the sky.  The most well known of the Chinese constellations are the 28 ‘lunar mansions.’  These are small groups of stars very roughly arrayed along the ecliptic, which is the apparent path of the sun, moon and planets across the sky.  As you’ll see in the links below, the Chinese used some stars, such as those in Orion, that are too far from the ecliptic for the moon to pass through them.  The 28 mansions were subdivided into four groups of seven; each group of seven represented one of four Chinese animals associated with the directions and the seasons:

1) The Blue/Green Dragon (Qing Long) of the East, associated with spring.  Note that the ancient Chinese color word qing was quite broad in meaning.  Blue and green were considered different shades of this broadly defined color.

2) The Red Bird (Zhu Que) of the South, associated with summer.   This mythical bird, with red and orange plumage, is distinct from the feng huang, also called the Chinese phoenix.

3) The White Tiger (Bai Hu) of the West, associated with autumn.

4) The Black Tortoise (literally Dark Warrior, Xuan Wu) of the North, associated with winter.  Xuan Wu was always shown as a tortoise with a snake wrapped around it, reflecting the folkloric belief that all tortoises were female and needed to copulate with snakes to reproduce.

Of the stars in tonight’s evening sky, those in Orion and Taurus form part of the White Tiger, while Gemini and the dimmer stars south and east of it belong to the Red Bird.

Along with the four large animals, Chinese astronomers defined three large constellations known as the three enclosures.  The largest of these is the ‘Purple Forbidden Enclosure‘ (Zi Wei Yuan) which includes all those stars near the North Pole of the sky which never set as seen from mid-northern latitudes.  The enclosure is ‘forbidden’ because it includes the North Star, which was the Emperor of Heaven because it always remains in one spot while other stars seem to go in circles around it, as if paying court.

The ‘Supreme Palace Enclosure‘ (Tai Wei Yuan) actually rises in the late evening in February.  Look east about 9 tonight for a set of stars in the shape of a backwards question mark.  We see this as the head of Leo, the Lion.  Rising under the backwards question mark is a right triangle of similar brightness.  For us, this is Leo’s hindquarters, but in China, it’s the northwest corner of the Supreme Palace enclosure.  The other side of this enclosure is a semi-circle of stars westerners recognize as part of Virgo, the Virgin.

The final enclosure, the ‘Heavenly Market Enclosure‘ (Tian Shi Yuan), won’t rise until very early in the morning in February, and isn’t in the evening sky until late May.  It centers on our constellations Ophiuchus and Serpens (Caput and Cauda), just north of the bright summer constellations Scorpius and Sagittarius.

So, I wish everyone a happy Year of the Tiger.  I’ll celebrate it by looking at the stars in a way I ‘m not accustomed to seeing them.

Terra Cotta Warriors: An army frozen in time

All eyes have been on China for the last few weeks as Michael Phelps, Usain Bolt and many other Olympians have been shattering world records at the 2008 Beijing Olympics. Media coverage was intense – but this particular video on the Terra Cotta Warriors caught our eye, because we’re eagerly anticipating May 18, 2009 – opening day for Terra Cotta Warriors: Guardian’s of China’s First Emperor at the Houston Museum of Natural Science. Here, Dirk gives us more context on these extraordinary treasures.
Dateline: 240 BC
Mighty Celtic tribes, far from being barbarians, rule over most of what is Western Europe today. Engaged in long distance trade with the Mediterranean, they will soon fall under the sway of an upstart from that region: Rome. Across the water on the northern shores of Africa another mighty empire blossoms: Carthage. It too will eventually fall under the sway of Rome. Further east, Egypt had long faded from its glory days and is ruled by descendants of a Macedonian general who served under Alexander the Great. The famous library in Alexandria is either in the planning stages or has just opened. Meanwhile, more than 7600 miles away, on a windswept hill in Oaxaca, traders from the city of Monte Alban set off to visit the big metropolis further north, Teotihuacan, to strengthen trade ties between these two cities.
China - Great Wall
Creative Commons License photo credit: mckaysavage

All of these cultures and all of these nascent empires are small fry, however, compared with what is happening in the Far East. There, in China, In 240 B.C. Ying Zheng, ruler of the Qin Kingdom, rose to power. He proclaimed himself First Emperor of the Qin, or Qin Shihuangdi.

Under Qin Shihuangdi’s rule, Chinese script was standardized, as were its currency and system of measurements. The territory was expanded into Vietnam. A huge central bureaucracy directed military and civil officials throughout the empire. This system of government remained virtually unchanged until the collapse of the Qing dynasty in 1911.
Qin Shihuangdi was obsessed with longevity. He sent emissaries to find an elixir of youth to ensure that he would live forever. Unfortunately, death caught up with him in 210 BC while he was traveling far away from the capital. His mortal remains were brought to his tombs, a trip which required his entourage to engage in a number of subterfuges to mask the smell of death in the convoy. It is said that a cart of rotting fish was pulled right behind the imperial sedan chair, to mask the decaying remains of the emperor.
In death, as in life, the emperor remains an imposing figure, leaving us with an incredible and imposing legacy. His tomb (for this link, hit cancel to start the video) has been located, but not yet excavated. According to historical sources, the emperor’s tomb was laid out in such a way to represent the entire empire, with huge pools of mercury representing rivers, lakes and seas. Gemstones set in the tomb’s ceiling represent the night sky. As was becoming a man of his rank, he was accompanied in his tomb by an army of servants and soldiers.
Creative Commons License photo credit:

In 1974, the same year in which Lucy was discovered, a peasant working the fields in the shadow of the imperial tomb, found fragments of a terracotta statue. This chance discovery led to one of the most magnificent archaeological discoveries of the 20th century; the army of terracotta soldiers. Approximately 8000 terracotta statues have been uncovered thus far. All of these require restoration and preservation, with some of these requiring up to one year’s worth of work before they can be displayed.

Until May 17, 2009, you will have to travel 8300 miles from Houston to go see these famous terracotta warriors in their Xi’an museum. However, starting May 18, there will be 20 statues in your own backyard. The Houston Museum of Natural Science will be hosting them until October 16, 2009. More information can be found here.