unit 5 - tides & eclipses

ih haet science

Tides

The rise and fall of the sea along the shore.

Spring Tides

Sun, moon, & earth in a straight line. High tides caused by moon and sun in line. Causes extreme high tides and extreme low tides.

Neap Tides

Sun, moon, & earth are at 90 degree angles (perpendicular to the earth). High tides are caused by moon and sun being perpendicular to each other. Causes medium high tides and medium low tides.

Eclipse

When an astronomical object is temporarily obscured by the passing of another object.

Solar elipse

When the moon passes between the sun and the earth

Lunar eclipse

When the moon appears darkened as it passes into earth’s shadow.

Penumbra

the partially shaded outer region of the shadow cast by an opaque object

Umbra

the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse