Phases, Eclipses, and Tides
Section 19.3
Moon Motions
• Revolves around Earth
once every 27.3 days
• Rotates around its axis
once every 27.3 days
• Because of the moons
movements, the same side
of the moon always faces Earth
Moon
Phases
29.5 day
cycle
FYI
Names of the Full Moons
January
February
March
April
May
June
July
August
September
October
November
December
Wolf Moon
Blue Moon – second
Snow Moon
full moon of a
Sap Moon
single month.
Pink Moon
Occurs, on average,
Flower Moon
every 2.72 years
Strawberry Moon
Buck Moon
Sturgeon Moon
Harvest Moon
Hunter Moon
Beaver Moon
Cold Moon
The Shadows
• Umbra – the darkest part of a shadow
• Penumbra – the part of a shadow surrounding
the darkest part
Eclipses
• When the moon’s shadow hits Earth or the
Earth’s shadow hit the moon
Only the people in the umbra can view
the eclipse
Half the Earth can view eclipse at
the same time
What causes tides?
• Tides are caused by gravity between the
Earth, moon, and sun
What causes tides?
• The moon’s gravity pulls on Earth’s
surface closest to the moon causing water
to create a bulge
• Water is stolen from the sides to create
the bulge
• The side of Earth furthest from the moon
has the least effect of moon’s gravity and
has a bulge that is the “left behind” water
Different kinds of tides
• The sun’s gravity can add to the moon’s
pull or even it out depending on the
positions of the sun, moon and Earth
Different kinds of tides
• Spring Tides
- highest high tides, lowest low tides
- sun, moon, & Earth are in line
• Neap Tides
- lowest high tides, highest low tides
- sun, moon, & Earth are at right angles
Tides