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Eratosthenes estimates the circumference of Earth using two sticks, in 240 BC.
Eratosthenes calculated the circumference of the Earth without leaving Egypt. He knew that at local noon on the summer solstice in Syene (modern Aswan, Egypt), the Sun was directly overhead. He knew this because the shadow of someone looking down a deep well at that time in Syene blocked the reflection of the Sun on the water. He measured the Sun's angle of elevation at noon on the same day in Alexandria. The method of measurement was to make a scale drawing of that triangle which included a right angle between a vertical rod and its shadow. This turned out to be about 7°, or 1/50th of the way around a circle. Taking the Earth as spherical, and knowing both the distance and direction of Syene, he concluded that the Earth's circumference was fifty times that distance.
If a thing's worth doing, it's worth doing well
(Proverb)
Follow Ups:
The Earth is round? You sure about that? Soon you be telling us that the Earth is warming up.
"The Borg is the ultimate user. They're unlike any threat your Federation has ever faced."
- Q, 2365
as I don't want to upset the balance of power as The Flat Earthers of LINN and NAIM Audio followers are doing an excellent job of it.
If a thing's worth doing, it's worth doing well
(Proverb)
The modern wells of astrophysics have verified his accuracy to within the length of a leg bone of the sacrificial chicken.
I missed this time of the year when I was living around the 62nd Parallel North, which the same parallel as where Alaska is to the west.
I remember we used to celebrate this day by starting up a huge bonfire in the afternoon and it'll basically burn until the next day to celebrate the longest day of the year.
This is what Yellowknife Bay looks like in late April. As you can you see the ice is just beginning to melt and it will take up to the last week of May to complete the meltdown. Also by this time of year, some of the natives are already greasing up their canoe for the upcoming fishing season. Fishing for fish such as Great Northern Pike, Arctic Char, Walleye, Arctic Grayling just to name a few that can be had to enjoy cooking in the bonfire.
If a thing's worth doing, it's worth doing well
(Proverb)
Winter solstice, not so much.
the North of the 60th parallel, but nevertheless we will be enjoying 17 hours of sunlight today in Calgary.
If a thing's worth doing, it's worth doing well
(Proverb)
Amazingly intuitive. Cool stuff!
Thanks, for link.
Egyptologist still believes that the Egyptians farmed out the contract to the aliens to build the pyramids...
If a thing's worth doing, it's worth doing well
(Proverb)
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