Eclipses Final

7/29/2019 Eclipses Final

1/28

During eclipse, pregnant women shouldnot go out, if they do they will have

miscarriage.

In many regions, it was believed thateclipses occur when evil mythological

creatures attack the sun: a giant turtle

(Vietnam), a jaguar (Latin America), a

dragon (Asia) or werewolf (Romania)

The Maoris believed that the lunareclipse is a sign of victory over their

enemy in a war.


2/28

In Tahiti, eclipse has been interpreted as the

lovemaking of the sun and the moon. So,

people in Tahiti find the event to besomething to look forward to since the

eclipse can bring a divine blessing.

An eclipse was also thought to foretell thedeath of great people like the Roman

emperor Nero and Catherine of Aragon.

The pregnant women in Mexico wear brightred pants with safety pins attached during

eclipse to avoid from suffering birth

problems.


3/28

Eclipse

Takes place when the shadow of a

celestial body partially or totallyblocks another celestial body.

Occurs when the sun, Earth and the

moon are in a straight line.


4/28

Kinds of Shadows

Umbra

the dark portion of theshadow

Penumbra

the lighter portion ofthe shadow.

(The position of the moon and Earth in

relation to these portions determineswhether an eclipse will be total or

partial. )


5/28

If you are in the umbra of the shadow, you will see a total eclipse.

If you are in the penumbra of the shadow, you will have a partial eclipse


6/28

Kinds of Eclipses

Solar eclipseoccurs when the

moon passes directly betweenthe sun and the Earth. The

moon blocks the light rays and

casts a shadow on earth.


7/28

A total solar eclipse is visible on

earth when the moon is on its

perigee. It usually lasts for 2 to 3

minutes, the longest is 7 minutes.

A solar eclipse occurs at least

twice a year during the new moon

phase of the moon.


8/28

8

Solar Eclipses When the Moons shadow covers part of the

Earth Only happens at New Moon

Three types: Annular, Partial, and Total


9/28

Partial

Solar

Eclipse


10/28

Here is an animation showing a total solar eclipse

Remember that it is not safe to stare at a solar eclipse !!!


11/28

This animation shows that the moon creates a small shadow which

Only allows certain areas of the earth to see a total solar eclipse.


12/28

12

Annular Solar Eclipse When the Moon is too far to completely cover the Sunthe umbra doesnt

reach the Earth

Sun appears as a donut around the Moon


13/28

13

Photos of an Annular Eclipse

http://sunearthday.nasa.gov/2006/multimedia/gal_010.php; photos taken by Fred Espenak


14/28

Is it safe to view solar

eclipse directly with

unaided eye?

What precautions in

viewing solar eclipse canyou suggest?


15/28

Lunar Eclipse

Occurs when the sun, Earth and

the moon are in a straight line.

The Earth casts a shadow on the

surface of the moon.

A lunar eclipse occurs 2 to 4

times a year during a full moon

phase.


16/28

16When the Earths shadow covers the Moon, we have a lunar eclipse


17/28

17

Three types of Lunar Eclipses

Penumbral lunar eclipsethe Moononly passes through the penumbra of

Earths shadow

Partial lunar eclipsepart of the Moonpasses through the umbra of Earths

shadow

Total lunar eclipsethe entire Moon

passes through the umbra of Earths

shadow


18/28

Lunar EclipseThe diagram shows

That the moon is covered by the

arths shadow, which makes this

clipse safe to look at.

otice the moon sometimes turns red

hen totality occurs.


19/28

19

Images from Fred Espenak

http://www.mreclipse.com/LEphoto/LEgallery1/LEgallery1.html


20/28

Why is the Moon red during an eclipse?

The Earths atmosphere filters some sunlightand allows it to reach the Moons surface

The blue light is removedscattered down to

make a blue sky over those in daytime Remaining light is red or orange

Some of this remaining light is bent or

refracted so that a small fraction of it reaches

the Moon

Exact appearance depends on dust and clouds

in the Earths atmosphere


21/28

This is an animation showing a total lunar eclipse from start

To finish.


22/28

Compare the kinds of eclipses by giving their

similarities and differences.Similarities Differences

Solar Eclipse1.

2.

3.

Lunar Eclipse1.

2.

3.


23/28

Label the parts of eclipses and identify the type.

1.

2. 3.

4.

5.

6.

7.8.

9.

11.10

.


24/28

Tides

The rise and fall of the ocean

waters.

Formed because of the attraction

between the moon and the Earth.


25/28

Kinds of Tides

There are 2 main kinds of tides: high tideand low tide.

In 24 hours, two high tides and two low

tides occur.

Spring Tidesoccur when the moon and

the sun are aligned at new moon or full

moon. These tides are very high.

Neap Tideswhen the sun and the moon

are at right angles. (neither very high nor

very low)


26/28

26

Tides and the Moon


27/28

Importance of Tides

Fishermen watch the tides before

they go fishing. They catch morefish when the tides are high than

when they are low.


28/28

Boats veer to the center of the waterand leave the ports when tides are high.

Ships arrive and leave only at high

tides when the water is deep enough toallow these vessels to come and go

safely.

Eclipses Final

Documents

Transcript of Eclipses Final