In AD 870, candles used to measure time were about _______ long.
Answers
120 m long
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Answer:
It is unknown where and when candle clocks were first used. The earliest reference to their use occurs in a Chinese poem by You Jiangu (A.D. 520).[1] Here, the graduated candle supplied a means of determining time at night. Similar candles were used in Japan until the early 10th century.
You Jiangu's device consisted of six candles made from 72 pennyweights (24 grains each), of wax, each being 12 inches high, of uniform thickness, and divided into 12 sections each of one inch. Each candle burned away completely in four hours, making each marking 20 minutes. The candles were placed for protection inside cases made of a wooden frame with transparent horn panels in the sides.[2] Similar methods of measuring time were used in medieval churches and earlier, famously by King Alfred the Great of England, first by counting the number of candles of a specific size burnt, and later by use of a graduated candle. Eventually, these clocks were replaced by normal clocks that we use today.
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