Presentation on theme: "Nancy Foote NASA Heliophysics Ambassador nancyfootehigley.com"— Presentation transcript:
Nancy Foote NASA Heliophysics Ambassador nancyfootehigley.com
Shakes out some misconceptions about the reason for seasons.
The tilt brings the Earth closer to the Sun so it’s warmer Football field model of the Sun-Earth System
1 yard = two million miles so the distance between 10 yards is 20 million miles Using this scale, if the Sun is roughly a million miles in diameter, how large should it be? Place your scaled Sun at the 50 yard line
The Earth is roughly 8,000 miles across. How big would it be on the same scale? How far is the Earth from the Sun? Draw your scale of the Earth on the 0 yard line.
Does the distance from the Earth to the Sun change a lot throughout the year? Closest distance is 147,000,000 miles Farthest distance is 152,000,000 miles
About 3% Less than 1 yard using our scale
The number of hours of daylight causes the seasons
Does the Sun always set at the same time each day? Is the number of hours of daylight the same each day? At what times of year does the Sun set the latest (and rise the earliest)? At what time of year are the days the shortest?
How do the hours of daylight compare with the hours of night in different places? Are there any months when hours of daylight are equal to hours of night? If there months when hours of daylight equal hours of night, are they the same months for any location on Earth?
What happens when all of the line intersect? What is the term for the exact date when the number of hours of daylight equal the number of hours of night? What is the special term for the day of the year when there are the most daylight hours? the longest night?