Time Tellers 1500 BC

Time Tellers 1500 BC - 2008 AD

The following are some landmarks in the history of telling the time.

1500 -1300 BC Sundials are used in Egypt as the earth rotates,
the gnomon - the upright part of the sundial - casts
shadow which moves to indicate the time.

1325 The first clock with a dial is installed in Norwich Cathedral, England

1350 The oldest known surviving alarm clock is made in wurzburg, Germany.

1364 Clocks are first used in people's homes.

1665 The first watches with minute and second hands are made.

1880 The first practical wristwatches are made for the German navy.

1949 The first atomic clocks is built in the USA.

1969 Quartz wristwatches are first sold in Japan.

2008 PARCS(Primary Atomic Reference Clock in Space). a super-accurate
laser-cooled caesium atomic clock, is tested on the international
Space Station(see image above).

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Names of months

The names of the months in English (as well in many other languages) come from Latin Words. January Januarius – this month was dedicated to Janus, the Roman god of doors. Janus had two faces, one looking back at the old year and the other looking forward to the new year. February Februarius – Februa was the Roman purification festival, which took place at this time of year. March ...

Chinese calendar

Present-day China uses the Gregorian calendar for most purposes, but traditional festivals, such as Chinese New Year, take place according to the ancient Chinese calendar. Legend has it that this was started during the reign of Emperor Huangdi in 2637 BC, and relates to the positions of the Moon and Sun. Heavenly systems Earthly branches 1 jia 1 zi (rat) 2 yi ...

Constellations

Groups of stars form patterns in the night sky, which are called constellations. There are 88 known constellations. The sumerians, a Middle Eastern civilization, probably named them, about 5,000 years ago. The largest is Hydra, the sea serpent, and the smallest is Crux Australis, the Southern Cross. Centaurus, the Centaur. Has the most stars that can be seen with the naked eye(94). Others include Aquila, the Eagle; Canis Major, the Great Dog; and Orion, the Hunter.

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