No gum, candy or chewing please! 
2/12/13 Agenda:
•Bell work
•Ch. 2.3 cont. Eclipses and Tides
Materials:
-Pencil
-Notebook
-Folder
DO: Today we will discuss
the relationship between
the Moon, eclipses and
tides.
DQ: How do you think the phases of the moon are
related to eclipses and tides?
2.3: Positions of the Sun and Moon affect Earth
Procedure:
• Read Ch.2.3 pages 63-66 individually –
Book only!
• Take out notebook and now take Cornell
notes
• Don’t forget to list vocabulary
• Answer the “Check Your Reading”
questions, as you read. Hint: there are 3.
• Answer review questions 1-6 on page 66.
• We will review the notes
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
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ECLIPSE

WHEN SHADOW MAKES SUN
OR MOON APPEAR DARK

UMBRA

DARKEST PART OF A SHADOW

PENUMBRA

SPREADING CONE OF
LIGHTER SHADOW AROUND
THE UMBRA
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
SHADOWS IN
SPACE CAUSE
ECLIPSES
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SUNLIGHT GOES PAST EARTH &
MOON LIGHTING ONE SIDE OF
EACH
BEYOND EACH BODY, IS A LONG,
THIN CONE OF DARKNESS,
SHADOW IN SPACE
2 BODIES FAR APART, USUALLY MISS
EACH OTHERS SHADOW
IF MOON, SUN & EARTH LINE UP
EXACTLY, A SHADOW CROSSES
EARTH OR THE MOON CAUSING AN
ECLIPSE.
ECLIPSE- WHEN SHADOW MAKES
SUN OR MOON APPEAR DARK
LUNAR ECLIPSE- MOON
DARKENS
SOLAR ECLIPSE- SUN DARKENS
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
LUNAR
ECLIPSE
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MOON BECOMES DARK
PASS THROUGH EARTH’S SHADOW
2 PARTS OF SHADOW
UMBRA- DARKEST PART
PENUMBRA- SPREADING CONE OF
LIGHTER SHADOW AROUND THE UMBRA
FULL MOON BEFORE LUNAR ECLIPSE
MOON MOVES INTO PENUMBRA
BECOMING LESS BRIGHT
MOON MOVES INTO UMBRA BECOMES
DARK
AFTER ABOUT 1 HOUR BEGINS TO MOVE
BACK INTO SUNLIGHT
TOTAL LUNAR ECLIPSE, ALL OF MOON
PASSES THROUGH UMBRA
PARTIAL LUNAR ECLIPSE, PART OR NONE
OF MOON PASSES THROUGH UMBRA
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
SOLAR
ECLIPSE
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SUN DARKENS
MOON’S SHADOW FALLS ON PART OF
THE EARTH
MOON MOVES IN FRONT OF SUN
NEW MOON DURING SOLAR ECLIPSE
SKY BECOMES DARK
MAY SEE CONSTELLATIONS
SUN, BLACK DISK, NEW MOON
SURROUNDED BY PALE GLOW
AFTER ABOUT 1 MINUTE SUN BEGINS
TO APPEAR AGAIN
ONLY PEOPLE IN THE MOON’S UMBRA
EXPERIENCE A TOTAL SOLAR ECLIPSE
MOON SMALLER THAN EARTH, SO
SHADOW IS SMALLER
BRIGHT LIGHT FROM SUN’S DISK CAN
DAMAGE EYES
NEVER LOOK DIRECTLY AT THE SUN,
EVEN WHEN MOON COVERS IT
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
MOON’S
GRAVITY
CAUSES TIDES
ON EARTH
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AVG. WATER LEVEL RISES AND
FALLS SLOWLY FOR ABOUT 6
HOURS
HIGHEST LEVEL = HIGH TIDE
LOWEST LEVEL = LOW TIDE
2 HIGH TIDES & 2 LOW TIDES IN
A LITTLE MORE THAN 24 HOURS
TIDES OCCUR BECAUSE MOON’S
GRAVITY CHANGES SHAPE OF
EARTH’S OCEANS
PULLS HARDEST ON SIDE OF
EARTH CLOSEST TO MOON
MOON’S PULL PRODUCES A
BULGE OF THICKER OCEAN
WATER ON SIDE OF EARTH
NEAREST MOON AND SIDE
FARTHEST FROM MOON
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
2.3: POSITIONS OF SUN AND MOON AFFECT EARTH
Spring Tides: Occurs during a New Moon or Full Moon. Alignment of
Sun, Earth and Moon combines gravitational pull causing a higher high
tide.
S
E
M
Neap Tides: Occur during 1st and 3rd quarter phases. The Moon is at a
right angle to Earth and Sun. Gravity of the Moon competes with the Sun’s
gravity resulting in a lower high tide.
M
S
E