Question

notice the yellow beams pointing toward the earth in the box labeled the \earth’s view\. these yellow lines represent sunlight facing towards earth. if the sun is the source of energy for earth, how might the tilt or motion of earth affect how much sunlight different areas receive?

1. on the right side of your screen, find the “tilt of earth’s axis” slider. slowly move the slider back and forth.

a. what do you notice happens to the sunlight beams as you increase or decrease the tilt?
b. how does this change which areas of earth receive the most direct sunlight?

Explanation:

Part a

When moving the "Tilt of Earth’s Axis" slider: If the tilt increases, the sunlight beams (yellow lines) will become more concentrated in some regions (like near the poles during extreme tilt) and more spread out in others, or the angle at which they hit different latitudes changes. If the tilt decreases, the distribution of the sunlight beams becomes more uniform across latitudes (less extreme seasonal differences in sunlight concentration). For example, a higher tilt (like Earth's actual ~23.5°) causes the Sun's rays to hit the Tropics more directly at solstices, while a lower tilt would make the direct sunlight zone more centered near the equator with less variation.

The tilt of Earth’s axis determines the latitude that receives the most direct sunlight (the subsolar point). When tilt increases, the subsolar point moves more pole - ward (toward the Tropic of Cancer or Capricorn at solstices), so the area with most direct sunlight shifts toward the hemisphere's summer pole - ward latitude. When tilt decreases, the subsolar point stays closer to the equator, so the area with most direct sunlight is more equatorial - centered with less seasonal shift. For example, with maximum tilt (~23.5°), the most direct sunlight is at ~23.5°N/S at solstices; with 0° tilt, it's always at the equator.

Answer:

• As tilt increases: Sunlight beams become more angled or concentrated in polar - tropical transition regions (more extreme seasonal sunlight differences, e.g., more direct rays at one hemisphere's summer pole - ward, more spread at winter pole - ward).
• As tilt decreases: Sunlight beams become more uniform across latitudes (less extreme seasonal differences, more even distribution near equator - like).

Part b