Candle clock and water Clock

5th grade, Exploring science
Candle Clock
Water Clock

1. Candle Clock More about Seasons Objectives To make learners understand functioning of Candle clock Reinforcement on topic seasons Water Clock Grade 5– Spring 2020 The City School Raffia Lecture –Water Clock Jun-10-20

2. homework What are candle clocks and how they measured time?

3. Candle Clock A candle clock can be used to measure time. In the past it was used to measure time at night or on cloudy days. There are marks on the side of the candle. As the candle burns down and the marks disappear you can measure the time that has passed. The marks on a candle are set to measure the passing of the hours. When a candle has burnt the wax between two marks an hour has passed. The candle needs to burn steadily. If it is in a draught it will burn more quickly so it is placed in a holder which lets you see the marks on the candle yet protects the candle from draughts.

4. Disadvantages of Candle clock If the  candle  is blown out before it reaches a mark, then it would be difficult to tell precisely how much time has gone by even, if it is re-lit. The   candle clock  can only be used to tell the time interval that has elapsed, and therefore, cannot be used to tell the exact time of the day.

5. The Sun does not rise and set at the same time every day. The table shows what time the Sun rises and sets on the first day of every month. You can look for patterns in the data by plotting a graph

6. Now plot graph for these values ( H.w )

7. May, June Jan, Feb The Sunrise is earliest in summers and late in winters. However, the sunsets are late in summers and earliest in Winters. Days get long in summers and short in winters. This is because of change in seasons. June Jan

8. Sunsets are earliest in winters and longest in summers. Summers Winters The length o

9. The Sun does not rise and set at the same time every day. The table shows what time the sun rises and sets on the first day of every month. You can look for patterns in the data by plotting a graph