Two hemispheres, one distance
Test an explanation against everything it should also explain.
What we know
- Earth’s axial tilt changes sunlight angle and daylight duration through the year. The hemispheres have opposite seasons. Earth passes its closest point to the Sun in early January.
- For an idealised calculation, imagine a place receiving 8 daylight hours in winter and 16 in summer. Each winter hour delivers half the energy per square metre of a summer hour. Ignore clouds and other factors in this model.
How to answer
Choose the conclusion best supported by the facts and press Check. You can revise an incorrect answer and use help whenever you wish.
Preparing the case…