SCIENCE AND TECHNOLOGY GRADE 7ECLIPSE.pptx

SCIENCE

1. 3 - 2 - 1 Entry Card 3 – Things I already know about eclipses 2 – Superstitious beliefs I know about eclipses 1 – Thing I want to know more about eclipses

2. Solar and Lunar Eclipses

3. ECLIPSE It occurs when the source of light is blocked when the sun , Earth and moon are in one straight line .

4. Lunar Eclipses It occurs when the moon passes through Earth’s shadow. (Full Moon)

5. Umbra – The dark inner portion of the shadow cone. Penumbral – the lighter outer portion of the shadow.

6. Types of Lunar Eclipses Total Lunar Eclipse Partial Lunar Eclipse Penumbral Lunar Eclipse

7. Total Lunar Eclipse – when the Moon passes completely into the Umbra, or total shadow of the Earth.

8. Partial Lunar Eclipse – Occur when the Moon does not fully move into the Umbra

9. Penumbral Lunar Eclipse – When the moon passes only through the penumbra, or partial shadow. They are barely visible .

10. Solar Eclipses It occurs when the moon is directly between Earth and Sun. (New Moon)

11. Types of Solar Eclipses Total Solar Eclipse Partial Solar Eclipse Annular Eclipse

12. Total Solar Eclipse – can only occur if you are at the exact spot within the moon’s umbra (which isn’t very big).

13. Partial Solar Eclipse – Visible if you are in the penumbra of the shadow . Only some of the moon will be shadowed.

14. Annular Eclipse – occurs when the moon is farthest from the Earth in its orbit. This makes the moon look smaller, so during the eclipse you see an outer ring of light from the Sun.

15. 2 Kinds of Eclipse Solar Eclipse Lunar Eclipse Daytime Nighttime When the Moon casts a shadow on the Earth, causing the sun to go dark. When the Earth casts a shadow on the moon, causing the moon to go dark. S M E S E M New Moon Full Moon

16. How often do Eclipses Happen? That depends. Lunar Eclipses happen more often than Solar Eclipses. Everyone who is experiencing nighttime during a lunar eclipse can see it.

17. How often do Eclipses Happen? But you have to be at the exact spot on Earth to see a Solar Eclipse. The spot on Earth is so small, that the same place only sees a Solar Eclipse every 350 years* .

18. Why Don’t We See Lunar Eclipses More Often? Well, lunar eclipses don’t happen everyday because the Moon’s orbit is tilted . So, during most months, the Moon is above or below the Earth.

19. Dates Object Type Where is the eclipse visible 15 Apr 2014 8 Oct 2014 Lunar Total West in Asia, East in North America, Parts of South America 29 Apr 2014 Solar Annular South in Asia, Australia, Pacific, Indian Ocean, Antarctica 23 Oct 2014 Solar Partial East in Asia, Much of North America, Pacific, Atlantic 20 Mar 2015 Solar Total Europe, Parts of Asia, Parts of Africa, West in North America, Atlantic, Arctic

20. Eclipse Venn Diagram

21. REMINDER: SCIENCE REPORTING ON MAY 7 AND 9 VIANA & VINCENT (PP. 346-347) CHRISTINE, ISRAEL, TANYA (PP. 350-352) CHASE & TERENZ (PP. 355-357) CYRIZ & FRANCIS (PP-371-375) LIAM & WINONA (PP. 379-382) COMPUTER PRESENTATION IS ON MAY 3 (TOMORROW)