Rotation and Revolution

Axis

The imaginary line
through Earth that
extends from the
North Pole to the
South Pole and is
the center of Earth’s
Rotation

Rotation

The spinning of Earth on
its axis that causes day
and night to occur

Direct

In the shortest unbroken line;
temperatures are higher where the
Sun’s Rays are direct

Indirect

Angled or spread out;
temperatures are lower where
the Sun’s rays are indirect

Revolution

The movement of one object
around a center or another
object

Hemisphere

Half of a sphere; Earth and
the celestial sphere can be
divided into northern and
southern or western and
eastern hemispheres

Tilt

The slant of Earth’s
axis which is 23.5
degrees from vertical
compared to Earth’s
orbital plane around
the Sun; results in the
North Pole always
pointing towards the
North Star

Seasons

The four natural divisions of the year based
on changes in temperature due to varying
amounts of sunlight received (both intensity
and number of daylight hours vary); caused
by the tilt of Earth during its revolution

Orbit

A curved path
followed by a
satellite as it
revolves around
an object