Session 26 Night, Day, and Time Zones
Section 2.1E
What causes day and night?
Objective: Students will be able to determine the effects the rotation of the Earth has.
Key Terms: Axis, Revolution, Rotation
Review Questions
1. What are the two motions of the earth?
2. What causes day and night?
3. Why are the number of hours of daylight and darkness not the same all year?
4. In which direction does the earth rotate?
Lesson Summary
 Revolution and rotation are the two movements on the earth.
 The earth’s rotation causes day and night.
 The number of daylight hours changes throughout the year because the earth’s axis is tilted.
 If the earth’s axis were not tilted, all parts of earth would have 12 hours and of day and 12 hours of night.
 The sun rises in the east and sets in the west because of earth’s rotation.
What are time zones? Page R58
Objective: Recognize the importance of standard time zones.
Identify the four time zones in the continental United States.
Review Questions
1. State the problem that is likely to arise using solar time.
2. If it is 12:00 noon in California, what time is it in Virginia?
3. What happens to the date if you cross the international dateline going east?
Lesson Summary
 The earth is divided into 24 time zones.
 There are four standard time zones in the continental U.S.
 Boundaries are drawn to keep whole states and neighboring cities in the same time zone.
Session 26 Night, Day, and Time Zones
Section 2.1E
What causes day and night?
Objective: Students will be able to determine the effects the rotation of the Earth has.
Key Terms: Axis, Revolution, Rotation
Review Questions
5. What are the two motions of the earth?
6. What causes day and night?
7. Why are the number of hours of daylight and darkness not the same all year?
8. In which direction does the earth rotate?
Lesson Summary
 Revolution and rotation are the two movements on the earth.
 The earth’s rotation causes day and night.
 The number of daylight hours changes throughout the year because the earth’s axis is tilted.
 If the earth’s axis were not tilted, all parts of earth would have 12 hours and of day and 12 hours of night.
 The sun rises in the east and sets in the west because of earth’s rotation.
What are time zones? Page R58
Objective: Recognize the importance of standard time zones.
Identify the four time zones in the continental United States.
Review Questions
4. State the problem that is likely to arise using solar time.
5. If it is 12:00 noon in California, what time is it in Virginia?
6. What happens to the date if you cross the international dateline going east?
Lesson Summary
 The earth is divided into 24 time zones.
 There are four standard time zones in the continental U.S.
 Boundaries are drawn to keep whole states and neighboring cities in the same time zone.