ôô

Three Lies You Learned in School

Everyday Einstein explores 3 lies students often learn in school and the true facts behind them.

By
Lee Falin, PhD
Episode #060

Why We Have Seasons

Ancient Greeks knew that the reason for the winter season was because for six months of the year Persephone, daughter of the harvest goddess Demeter, was in the underworld with her husband Hades. Mother and daughter missed each other so much during this time that the world languished in cold barrenness until they were reunited in the spring.

Had the Greeks gone to the trouble of visiting the southern hemisphere, they would have seen that perhaps southern Demeter didn’t love her daughter as much as northern Demeter did, because when it's winter in the northern hemisphere, the southern hemisphere is experiencing summer time.

See also: When to Capitalize Seasons

An equally incorrect account of seasonal change taught to many of us is that in the winter the Earth is further from the sun…or at least the top half of the Earth is…somehow…even though it’s a ball…and connected to the bottom half…hmm.

In fact you might be surprised to learn that the Earth is actually furthest from the sun at the beginning of July, around 152 million km away, while in December it reaches its closest point to the sun, around 147 million km away. So what gives?

The real reason we have seasons is because Earth is tilted on its axis. During summertime in the northern hemisphere, the axial tilt is towards the sun, which results in the sun’s rays being able to strike the northern half of the planet more directly and for a longer amount of time than in the southern hemisphere.

During wintertime, the Earth is titled the other way, so the sun appears lower in the sky. This also causes the sun’s rays to be more spread out, and the amount of time those rays strike the Earth is shorter.

Conclusion

So now you know the truth about why airplanes fly, what causes different seasons, and how evolution works. The next time you’re flying in an airplane in the summertime watching Jurassic Park, be confident in the fact that you will be one of the few people who really knows what’s going on.

If you liked today’s episode, you can become a fan of Everyday Einstein on Facebook or follow me on Twitter, where I’m @QDTeinstein. If you have a question that you’d like to see on a future episode, send me an email at everydayeinstein@quickanddirtytips.com.

 
Betterment LLC is an SEC Registered Investment Advisor. Brokerage services are offered by Betterment Securities, an SEC registered broker-dealer and member FINRA/SIPC.
Investments are not FDIC Insured. No Bank Guarantee. May Lose Value.
Investing in securities involves risks, and there is always the potential of losing money when you invest in securities.
Before investing, consider your investment objectives and Betterment's charges and expenses.
Not an offer, solicitation of an offer, or advice to buy or sell securities in jurisdictions where Betterment and Betterment Securities are not registered.

Plane image from Shutterstock

Pages

About the Author

Lee Falin, PhD
The Quick and Dirty Tips Privacy Notice has been updated to explain how we use cookies, which you accept by continuing to use this website. To withdraw your consent, see Your Choices.