Monday, May 6, 2013

The Earth's Tilt and Seasons

About seven months ago I wrote about the cause of Earth's Seasons.  As a short recap, Earth's seasons are not due to Earth's distance from the Sun.  Earth's seasons are a result of Earth's 23.5 degree tilt.  When the Earth is tilted toward the Sun, we have summer.  When the Earth is tilted away from the Sun, we have winter.  I'm always very wary of the use of the words 'toward' and 'away'.  The use of these words still focuses on distance.  It's not the distance that gives us seasons, it's energy.  When the Earth is tilted toward the Sun, that side of the Earth receives more direct sunlight (more energy) and temperature increases.

It always bugs me books skip the direct sunlight/energy part of this explanation.  My daughter's Science Encyclopedia book leaves this out.


I'm glad to see that the picture shows Earth revolving around the Sun in the correct direction, but I wish a line was added in the description to specifically point out more direct sunlight and/or energy.  Simply stating toward and away from the Sun keeps the focus on distance and continues to push the misconception of seasons being caused by distance.  

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