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When were the First Mechanical Clocks Made?

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The first mechanical clocks are believed to have been made in China in 1088 AD. Later in 1200s, they were first made in Europe. Such clocks made in Europe were driven by a weight on the end of a cord wound round a drum. As the drum rotated, it turned the hands of the clock. The earliest known clock was made in Spain in 1276 AD and the oldest mechanical clock that still works is in Salisbury cathedral in Britain. It was made in 1368. These clocks had devices called escapements to keep the hands turning at the correct rate, so that the clocks depicted the correct time.
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What is a Geostationary Orbit?

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Artificial satellites sent from the Earth orbit around the earth. The ones near the Earth orbit faster than the ones far away. A satellite 35,900 Km above the Earth's surface, takes 24 hours to orbit once. The satellite is always above the same point on the Earth's surface as the planet rotates. Geostationary orbit is also called as geosynchronous ' orbit. Such satellites are used to receive telephone and television signals and retransmit them over long distances.
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Black Panther

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Africa and Asia, black panthers are black-coated leopards, and in North, Central, and South America, they're dark-coated jaguars. In other words, “black panther” is an umbrella term used to refer to any leopard or jaguar with an unusually dark coat. Black panthers are not specific species, but refer to the blackened individuals of several panthers. Cats, especially large species, usually find some black individuals with different colors from the original ones. Leopards with normal coat color can produce the same litter cubs with black coat and normal coat color. Descendants who give birth to normal coat colors have less impact on survival than albinism, so melanism is more common than albinism, and species living in rain forests or bushes may even be more conducive to survival due to melanism. Under the bright light, the blackened leopard can find that the body hair is not pure black, but dark brown with different shades, and it can still recognize the unique markings of various le...
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Common Green Forest Lizard - ( © WildStoryLk )

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Common Green Forest Lizard  Visit Wild Story LK The C ommon Green Forest Lizard   (Calotes calotes)   belongs to the family of  Agamidae.It  is also called   පළා කටුස්සා(palaa katussa)   in  sinhala. This  is a large species of  Agamid .Green  forest lizards mostly live in Sri lanka and also  India.This  lizard highly arboreal and widespread the plains and midhills where elevation up to about  1500 m.  Read More 
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