History of Time  Primitive methods of measuring time:  Prehistoric man, by simple observation of the stars, changes in the seasons, day and night began to come up with very primitive methods of measuring time. This was necessary for planning nomadic activity, farming, sacred feasts, etc. The earliest time measurement devices before clocks and watches were the sundial, hourglass and water clock. Primitive methods of measuring time:  The forerunners to the sundial were poles and sticks as well as larger objects such as pyramids and other tall structures. Later the more formal sundial was invented. It is generally a round disk marked with the hours like a clock. It has an upright structure that casts a shadow on the disk - this is how time is measured with the sundial. Sundials:  Sundials Egyptians measured the time of day by using Sundials. Sundials rely on the sun to tell time. These early timekeepers discovered that hours are shorter in the winter and longer...

Powerpoint presentation on Mo... Presentation Transcript Money:  Money Numismatics is the scientific study of money . Oldest Coins: Oldest Coins Ancient Greek coins. Obverse (front) and reverse (back) of a coin of Mithradates , King of Pontus, about 100 B.C. (above); and of a coin of Alexander the Great, 300's B.C. (left). The custom of showing a ruler or head of government on the obverse of coins has continued to the present day Obverse and reverse of a Roman solidus of the emperor Constantine III (early A.D. 400's) As the history of money tells, the first people who are known to have used coins as money were the Lydians , Lydian electrum trite (4.71g, 13x10x4 mm). This coin type, made of a gold and silver alloy, was in all likelihood the world's first, minted by King Alyattes in Sardis, Lydia, Asia Minor (present-day Turkey), c. 610-600 BC. EARLY ANCIENT SILVER COIN FROM INDIA  : EARLY ANCIENT SILVER COIN FROM INDIA COINS...

Weather and Seasons Weather and Seasons: Weather and Seasons Weather and Seasons: Weather and Seasons Weather Our Earth is surrounded by a layer of air called atmosphere. Sometimes air becomes hot and sometimes it becomes cold. This change in air is known as weather. Weather keeps changing from day to day and sometimes from hour to hour. Seasons -When weather remains the same for a long period, we call it season. We have some months when it is very hot, some months when it rains heavily and some months when it is cold and chilly. We also have spring and autumn when it is neither too hot nor too cold. Seasons: Seasons Spring is a time When children play, Flower bloom And all is gay. Summer is hot, To stay cool, Everyone wants a dip In the pool. Monsoon clouds Filled with rain, Make you feel, Cool again Autumn is short And the leaves begin to fall, Playing in the open Is fun for all. Winter is cold. On sunny days People bask In the sun’s rays. Season: Season April and May are the hot...