# C13 L1 How Does Earth's Orbit Affect the Seasons?

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### Why does the cycle of day and night occur?

The cycle of day and night occurs because Earth rotates on it's axis.
When a place on Earth faces the sun, it is day in that place. When that place faces away from the sun, it is night.

### As you travel west from one time zone to another, is it one hour earlier or one hour later?

One hour earlier.

12:00pm

### Explain why officials needed to set up time zones in the late 1800s.

Long ago, people didn't need to know the exact time. And each place used local time. This changed in the late 1800s as trains were starting to travel long distances. If each train station had kept its own time, there would have been confusion. People needed to develop standard times.

### Why does Earth have seasons?

Earth's axis is not straight up and down in relation to its orbit. The Earth's axis is tilted about 23.5 degrees. During part of the year, half of Earth is tilted toward the sun. On that part of Earth, it is summer. On the part tilted away from the sun, it is winter.

### When it's summer in the Northern Hemisphere, what season is it in the Southern Hemisphere? Explain.

During summer in the Northern Hemisphere, the Northern Hemisphere points or tilts towards the sun. At the same time, the Southern Hemisphere is therefore tilting away from the sun and so it is their winter season.

### What is the day called that has the most hours of daylight?

The summer solstice.

### What is the day called that has the least amount of daylight?

The winter solstice.

### Why is it warmer in the summer than in the winter?

During the summer, that hemisphere is tilted towards the sun.
The number of hours of daylight is greater than the number of hours of darkness. And, the sun's rays strike part of the hemisphere directly, so the weather is warm.

### In Antarctica, why is it cold even in the summer?

Sunlight that reaches Antarctica, even in the summer, is at a low angle adn more spread out. This results in low temperatures all year round.

### sun

The star at the center of our solar system.

### rotate

To spin on an axis.

### axis

An imaginary line that passes through Earth's center and its North and South Poles.

### revolve

To travel in a closed path.

### orbit

The path one body takes in space as it revolves around another body.

### equator

An imaginary line around Earth equally distant from the North and South Poles.

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