1. You will be able to use your Science
5th Grade Science
Test Will Be August 26th.
You will be able to use your Science
Notebooks

2. 1. In ancient times, why would a cloudy day make it hard to know what time it was?

3. Ancient people used shadow clocks to tell time
Ancient people used shadow clocks to tell time. Without the sun, you can't use a shadow clock!

4. 2. Say one morning the Earth suddenly stopped spinning
2. Say one morning the Earth suddenly stopped spinning. Would a shadow clock still work? Explain.

5. A shadow clock only works because the shadow moves across the dial
A shadow clock only works because the shadow moves across the dial. So if the Earth stopped spinning, the shadow clock would be useless!

6. 3. The planet Mercury takes 176 days to do one spin around its pole
3. The planet Mercury takes 176 days to do one spin around its pole. Compared to the Earth, would the Sun appear to move more quickly across Mercury's sky or more slowly? Why?

7. The Sun would appear to move much more slowly across Mercury's sky than Earth's sky, because Mercury spins much more slowly than the Earth.

8. 4) A girl named Lindsey has 4 creases on each finger instead of 3
4) A girl named Lindsey has 4 creases on each finger instead of 3. If she counts like an Egyptian, what number will she count to with one hand?

9. Lindsey will count to 16 with one hand.

10. 5) Lindsey built a clock with 16 divisions, called Lindsey Hours
5) Lindsey built a clock with 16 divisions, called Lindsey Hours. Just like our clocks, the hour-hand on Lindsey’s clock goes around twice per day. How many Lindsey Hours are in one day?

11. There are 32 Lindsey Hours in one day. (16 hours +16 hours = 32 hours)
There are 32 Lindsey Hours in one day. (16 hours +16 hours = 32 hours)

12. 6. Who came up with the 12 hour daytime and nighttime schedule?
The Egyptians

13. 7. What is another name for a sundial? Shadow clock

14. 8. What does a.m. stand for?
It is Latin for ante-merediem which means before midday.

15. 9. What does p.m stand for?
It is Latin for post-meridiem which means after mid-day.