# Study Guide - Moon Phases, Eclipses, and Tides

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### 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.

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