Skip to main content

Week 2 Day 4 - The Intellectual Devotional: Eratosthenes

Week 1 Day 4 - The Intellectual Devotional:  Eratosthenes - Ann Again and again

Day 4 is for science and today's subject is Eratosthenes (276-194 BC).  The chief librarian of Alexandria who devised a way to measure the earth's size.  I've read this page two times and my mind is still boggled.  It took a water well, the sun and a measuring stick.  Oh, and a pacer - a professional walker trained in taking perfectly equal steps.  What?!?

On June 21st, the longest day of the year, Eratosthenes got crackin' with his plan to visit a special well in the neighboring town of Syene and wait for the sun to hit the bottom of the well. That time was 12 noon. By seeing the bottom of the well this meant that the sun was directly overhead in Syene, which was due north of his town of Alexandria.  If the sun was directly overhead in Syene then the suns rays must be hitting at an angle in Alexandria.  On June 21st (I'm assuming the following year, they don't say) Eratosthenes took a measuring stick and captured the angle cast by the shadow.  He knew the angle of the shadow was equivalent to the angle formed by the two cities and the center of the earth.  Are you with me?

There's division happening, and fraction making and percentages taking place.  What a brain this man had!  There's even a little quip about a nickname given to him by his contemporaries, "Beta".  He had so many interests that they considered him a dabbler, which they attributed to being second-class, a beta.  (I think they were just jealous.)

This brilliant man estimated the circumference of the earth to be 24,700 miles.  Today, using the exact same principles developed by Eratosthenes 2,000 years ago, modern instruments estimate the distance around the equator to be 24,902 miles.

There's so much more to learn!  I'm really enjoying this book.  (I need to read this page again.)

Popular posts from this blog

Miss Poodle Perm, That's Me!

Jill of Scary Mommy is doing a linky post about school pictures. You know the ones, possibly you didn't smile a sweet smile, just the smirk of panic. Or you didn't know it was picture day because you had been out sick for a week and you show up in your most comfortable shirt and bed-head. (Yep. That happened to me. The smile was good though!)

Well, my scanner isn't working or else I would post a particular picture from Freshman year. Since I don't have a visual, here's the story:

I remember my first day of High School. Actually what I remember is the picture taken of me leaving for my first day of High School. I'm wearing a brave smile, but the hair, the hair, my hair style was a nightmare.
My two best friends and I were going to be attending a High School out of our district. That was stressful enough. To add to this new-ness we wanted new looks as well. K. was going to sport the Argyle and Alligator shirt look. W. was going for 'All Monogrammed, Al…

How to Find the Safest Gear for your Baby

Nothing compares to the joys of being a parent. Having a newborn in the family brings couples closer and makes the entire household more cheerful and interesting. But as we all know, being a parent is not just about spending time with your baby. More than anything else, it also requires exerting a lot of effort to make sure that your baby is always safe and free from potential hazards. To further help you in this endeavor, here are some useful tips for finding the safest gear for your baby as you go through various baby product guides:

Opt for a non-toxic gear. The first thing you need to check is the composition of the safety gear. What is the material made from? Is it non-toxic? Be sure that it is because babies have a strong tendency to put everything they see or touch in their mouths. It goes without saying that a safety gear that is made from toxic materials could poison your baby, in the long run, so be very careful about the safety gears you purchase.
Make sure it is sturdy. The …

Yes, I'm a Dork for the Grocery Outlet

So our neighborhood was notified that a Grocery Outlet - Bargain Market would be opening in the new year.  I can't tell you how thrilled I was to hear this!  And when I received my friendly Grocery Outlet postcard with my friendly notice of the friendly festivities for their Grand Opening I actually put it on my calendar.  I knew exactly where I was going to be on Saturday morning.

Whoo Hoo! There was a giant "Wheel - o - Bargains".  I spun and won a $1 off my purchase.  Oh man I can't tell you how happy I am when I get money off my purchase.  yeah baby.  We were one of the first 1000 customer's so my husband and I received free Grocery Outlet - Bargain Market reusable bags!  (Rob was so excited.  Yes, he can be a dork sometimes too.)

What is it about this place?  Most of the items are things that I've never heard of, or have any interest in, however I am drawn to it like a kid to a candy store.  (Or better yet, like a wine lovin' mom who's found some…