The imaginary line that passes through Earth's center and the North and South poles.
The spinning of Earth on its axis.
The movement of one object around another.
System of organizing time that defines the beginning, length, and divisions of a year.
When the sun appears furthest north of the equator once each year and furthest south each year.
The noon sun is directly overhead on the equator, rises due east, and sets due west.
Different shapes of the moon you see from Earth
When an object in space comes between the sun and a third object, it casts a shadow of that object.
Occurs when the moon passes between the Earth and sun, blocking sunlight from Earth.
The very darkest part of the moon's shadow.
Another larger part of the moon shadow, it is less dark.
Occurs at a full moon when Earth is directly between the moon and the sun.
The rise and fall of the ocean that occurs every 12.5 hours or so.
A tide with the greatest differences between consecutive low and high tides. Comes from an old English word, springen, meaning "to jump"
A tide with the least differences between consecutive low and high tides. Occur twice a month.