Unit 4.2: Celestial Observations

An imaginary dome of the sky onto which all celestial objects such as stars, moons and planets can be plotted.

• Sun

• Celestial Sphere

• Apparent Motion

• Real Motion

The point directly over an observer's head.

• Apparent Motion

• Celestial Sphere

• Real motion

• Zenith

How a celestial object actually moves.

• Apparent motion

• revolution

• Real motion

• rotation

How a celestial object seems to move.

• Real motion

• Rotation

• Revolution

• Apparent motion

Height of a celestial object above the horizon measured in degrees.

• Altitude

• Height

• Zenith

• Polaris

This is the lowest altitude that an object can have to an observer.

• 90

• 3

• 0

• -1

This is the highest altitude an object to an observer.

• 0

• 1

• 100

• 90

The highest point the Sun can be in the sky.

• Sunrise

• Sunset

• Solar noon

• Midnight

Polaris will always be in this direction.

• North

• South

• East

• West

An object's __________ will always point in the opposite direction of the Sun.

• Zenith

• Altitude

• Shadow

• Solstice