SKU: 41240918476

Finding the Speed of Light: The 1676 Discovery That Dazzled the World

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Finding the Speed of Light: The 1676 Discovery That Dazzled the WorldMore than two centuries before Einstein, using a crude telescope and a mechanical timepiece, Danish astronomer Ole Romer measured the speed of light with astounding accuracy. How was he able to do this when most scientists didn't even believe that light traveled? Like many paradigm shattering discoveries, Romer's was accidental. Night after night he was timing the disappearance and reappearance of Jupiter's moon Io behind the huge, distant planet.

More than two centuries before Einstein, using a crude telescope and a mechanical timepiece, Danish astronomer Ole Romer measured the speed of light with astounding accuracy. How was he able to do this when most scientists didn't even believe that light traveled? Like many paradigm-shattering discoveries, Romer's was accidental. Night after night he was timing the disappearance and reappearance of Jupiter's moon Io behind the huge, distant planet. Eventually he realized that the discrepancies in his measurements could have only one explanation: Light had a speed, and it took longer to reach Earth when Earth was farther from Jupiter. All he needed then to calculate light's speed was some fancy geometry.



Binding Type: Hardcover
Publisher: Tilbury House Publishers
Published: 03/12/2019
ISBN: 9780884485452
Pages: 32
Weight: 1.10lbs
Size: 9.10h x 11.20w x 0.40d

Review Citations: Kirkus Reviews 02/01/2019 pg. 163
School Library Journal 06/01/2019 pg. 94
Hornbook Guide to Children 07/01/2019 - Recommended, Satisfactory

Accelerated Reader Quiz #/Name: 504184 / Finding the Speed of Light: The 1676 Discovery That Dazzled the World
Reading Level: 5.1 / Interest Level: Middle Grade / Point Value: 1
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SKU: 41240918476

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ChiGirl
Omaha, US
★★★★★ 5
Very sturdy and sleek looking laptop stand
Color: silver
I was skeptical when I first ordered this. It didn't look very sturdy in the pics, but I was wrong. It is very sleek looking and functional, with the adjustable height. Very modern looking as well and my MacBook Pro fits perfectly on it. Very glad to have purchased this for my home office.
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Reviewed in the United States on March 2, 2024
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Susan Pomeroy
Massapequa, US
★★★★★ 4
Sturdy, works great, not quite perfect.
Color: silver
This was the perfect stand to use when my desktop computer crashed and I had to work on my laptop without killing my neck. It's sturdy, well made, and works exactly as advertised. Adjustment is smooth and simple. I was able to work with my monitor at a comfortable height and distance, and it saved my bacon! But, would I want to work on it indefinitely? No. Two things are lacking for me. First, there's a height adjustment, but no angle control. This means that at its max height, the display has a small downward tilt. It also means that on zoom calls, I had to fiddle with the monitor height until my whole head was framed, rather than cut off. Not a dealbreaker, but annoying over the long term, especially with lots of zoom meetings. Second, I'm not sure why I was surprised, but the stand-plus-laptop combo created a kind of aluminum "monolith" on my desktop. I couldn't bend to peer under it, or over it either. It felt as though part of my desk (albeit a narrow portion) became inaccessible. This too is a quibble--I just happen to like a more open and airy feeling. These two nits aside, this is a sturdy and well designed stand that works well and will last a long time.
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Reviewed in the United States on May 27, 2026
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Verified Purchase
Elizabeth
Alexandria, US
★★★★★ 5
Replacement stickers are on the way!!
Color: silver, Color: silver
Edit: Customer service was lovely and I have replacement stickers on the way. This fabulous product has helped me so much and I can't be without it. Back up to a 5 star review. I purchased this product in April 2024. The stickers that help the laptop 'grab' onto the stand are either gone or unstable. See picture below. Can it be repaired with new stickers? How do I get them?
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Reviewed in the United States on July 19, 2025
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ProudPapa
Boise, US
★★★★★ 5
Sixty Bucks? Yep. And I'd buy another one.
Color: silver
OK, I had my doubts. Yes, the iLevel2 is highly-reviewed. And yes, it's really (really) important to have your laptop screen at eye level (get it? iLevel?) But spending 60 dollars on an adjustable laptop stand? Couldn't I just pile up a couple of old books for free? Well, as a contractor once told me when I made a really dumb suggestion, "You COULD do it that way..." The iLevel2's main virtue is that the angle/height adjustment knob is rock-solid, as is the platform. It's just an extremely well-made, solid product. And the adjustment knob, which is on a left-right track on the front of the product, allows you to dial in your laptop's screen height to the millimeter. Result: a totally-custom, ergonomically-friendly setup. Love it.
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Reviewed in the United States on December 13, 2024
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Russ
Houston, US
★★★★★ 3
Underwhelming
Color: silver
Too much hype. It just holds the laptop. Buy something cheaper. The slide adjuster isn’t useful to me at all.
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Reviewed in the United States on May 9, 2026

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