In 2012, a group of students from the University of Sheffield (United Kingdom) discovered the perfect way to decorate a Christmas tree. The team developed a calculator based on four mathematical formulas that predict the need for balls, needles and lights needed to decorate a tree properly. Thus, to decorate the 180 cm tree you need: 37 balls, Christmas lights of 565 centimeters and 919 centimeters of stains. In terms of the size of the crown, it is calculated by dividing the height of 10 centimeters tall.
"Our formulas allow Christmas to be easy for everyone," they called "Treegonometry" ("trigonometry" and "tree", the origin of this original mathematical application in English). In addition to home use, the application of public administrations and private companies will be very helpful in giving a touch of Christmas to one of the big trees that can be seen on the streets around the world. For example, August 21, normally placed in Trafalgar Square (London), has an average height of 21 meters, so 433 balls need to be properly decorated.
These ornamental trees are ancient traditions from the northern and central Celtic towns. Many Gods imagined themselves and worshiped them and, in winter, Frey was celebrated in honor of the goddess of Christmas Sun and fertility. There, they built a tree that represented Yggdrasil, the northern world of the mythological tree, the realm of men, gods and other creatures.
Likewise, they were common in firing houses, because their leaves were never lost or they lost their green color, they became the symbol of life and resurrection. St. Boniface, the German evangelist, has the most widespread belief that this pagan tradition took advantage of a new meaning and adapted to Christian belief. Through a tree that replaced Odin's worship, he decorated the pine and apples (symbol of the origin of origin) and the candles (the symbol of Jesus).
source: Very interesting