How can we help?

You can also find more resources in our Help Center.

30 terms

Moon Phases, Eclipses and Tides

STUDY
PLAY
New Moon
Waxing Crescent
First Quarter
half full
Waxing Gibbous
Full Moon
Waning Gibbous
Third Quarter
exactly half
Waning Crescent
Waxing
To increase gradually in size. The illuminated part of the moon is getting bigger.
Waning
To decrease gradually in size. The illuminated part of the moon is getting smaller.
Crescent
Less than half of the moon is fully illuminated
Gibbous
More than half, but less than fully illuminated
Quarter
One half of the moon (facing Earth) appears to be illuminated.
Gravity
the force of attraction between any two objects in the universe.
High tide
the maximum height reached by a rising tide.
Low tide
the minimum height of a falling tide.
Neap tide
a tide with the smallest difference between high and low tide. occurs when the Sun, Moon, and Earth form a right angle. Occurs during first quarter and last quarter phases.
Range
the difference between the greatest value and the smallest value. To find this you subtract the smallest value from the greatest value.
Spring tide
a tide with the biggest difference between high and low tide. Occurs when the Sun, Moon, and Earth are aligned (in a line). Occurs during new moon and full moon phases.
Tides
The regular rise and fall of the level of water in the ocean.
Phase
One of the different shapes of the moon as seen from Earth.
Eclipse
The partial or total blocking of one object by another.
Lunar Eclipse
The Earth blocks the sunlight from reaching the moon. This occurs when the moon is in the full moon position.
Solar Eclipse
The moon blocks the sunlight from reaching the Earth. From Earth we can't see the sun. This occurs when the moon is in a new moon position.
Umbra
The darkest part of a shadow where a total eclipse will occur.
Penumbra
The lighter part of the shadow surrounding the umbra where a partial eclipse will occur.
Total solar eclipse
a complete blocking of the sun. occurs when you are standing in the moon's umbra.
Total lunar eclipse
a complete blocking of the sunlight from reaching the moon. occurs when the moon is completely in the Earth's umbra
partial solar eclipse
part of the sunlight is blocked by the moon. occurs when you are standing in the moon's penumbra
partial lunar eclipse
part of the sunlight is blocked from reaching the moon. occurs when the moon is partly in the umbra and partly in the penumbra.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.