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originally posted by: dragonridr
a reply to: bloodymarvelous
Your math is so far off I dont believe you understand what an arc second is. For example 1 degree is 60 arc minutes. A arcminute is 1/60 th of one degree. And one arc second is 1/3600 a degree.
Now the earth rotates 15 degrees per hour
and one degree at the equator is 3600 square miles,this changes as you travel further north do to convergence. See where your mistakes are your not moving decimal places and well some just wrong.
For example the Egyptian calender was set up on 360 days a year,off by 5.25 days. Now just this fact alone shows they couldn't figure out speed of light because let's face it there base measuring system was wrong.
originally posted by: bloodymarvelous
So it doesn't really matter how they measured time, so long as they understood there was some correlation between how long a day is, and how big the Earth is around.
originally posted by: bloodymarvelous
So it is highly likely the Egyptians would have used a 360 degree convention. If not all of them, then surely some of them.
originally posted by: bloodymarvelous
And once we've got it correlated that far...... there's no reason to get hung up on the units anymore.
originally posted by: bloodymarvelous
The Earth's North/South full circumference (going all the way around) is exactly 40 million meters.
originally posted by: bloodymarvelous
Their calculation of a Year is meaningless to this discussion. The ratios involved here are based on their calculation of a day. Nowhere is their year involved.
originally posted by: bloodymarvelous
(Besides we needn't ignore the possibility that it may not be the Dynastic Egyptians who built the structure anyway.)
originally posted by: bloodymarvelous
I'm simply pointing out that arriving at the number 29.8782458 does not require them to be committed to using modern units of measure.
originally posted by: Harte
originally posted by: bloodymarvelous
The Earth's North/South full circumference (going all the way around) is exactly 40 million meters.
No, it's not "exactly" 40 million meters. It's 39,931 meters.
originally posted by: bloodymarvelous
Their calculation of a Year is meaningless to this discussion. The ratios involved here are based on their calculation of a day. Nowhere is their year involved.
You make this claim without bothering to check how they calculated their days, as I pointed out above.
originally posted by: bloodymarvelous
(Besides we needn't ignore the possibility that it may not be the Dynastic Egyptians who built the structure anyway.)
A convenient back door exit from the trap you set for yourself.
originally posted by: bloodymarvelous
I'm simply pointing out that arriving at the number 29.8782458 does not require them to be committed to using modern units of measure.
In fact, it does. You've just made that argument yourself with your claim that they used 360 degrees, meters, and seconds, didn't you.
Harte
originally posted by: dragonridr
a reply to: bloodymarvelous
.For example the Egyptian calender was set up on 360 days a year,off by 5.25 days. Now just this fact alone shows they couldn't figure out speed of light because let's face it there base measuring system was wrong.
originally posted by: Byrd
originally posted by: dragonridr
a reply to: bloodymarvelous
.For example the Egyptian calender was set up on 360 days a year,off by 5.25 days. Now just this fact alone shows they couldn't figure out speed of light because let's face it there base measuring system was wrong.
Not quite correct about the Egyptian year... they did have a 360 day calendar but they added to it the 5 "epigomenal days", effectively making it 365 days. It crept out of order and needed reforming but was one of the more accurate ones in the ancient world.
But they got it wrong.
One meter is defined as being exactly one ten millionth the distance from the equator to the North Pole. (That is literally what the commission that devised the Metric system defined it by, and they took a lot of pains to carefully measure it.)
physics.nist.gov...
Thus, the meter was intended to equal 10-7 or one ten-millionth of the length of the meridian through Paris from pole to the equator. However, the first prototype was short by 0.2 millimeters because researchers miscalculated the flattening of the earth due to its rotation. Still this length became the standard.
Why four? But no it isn't. Four seconds is 0.0011º.
Four seconds is 1/60 of a degree of rotation.
originally posted by: Phage
a reply to: bloodymarvelous
physics.nist.gov...
Thus, the meter was intended to equal 10-7 or one ten-millionth of the length of the meridian through Paris from pole to the equator. However, the first prototype was short by 0.2 millimeters because researchers miscalculated the flattening of the earth due to its rotation. Still this length became the standard.
Why four? But no it isn't. Four seconds is 0.0011º.
Four seconds is 1/60 of a degree of rotation.
But they got it wrong.
One meter is defined as being exactly one ten millionth the distance from the equator to the North Pole. (That is literally what the commission that devised the Metric system defined it by, and they took a lot of pains to carefully measure it.)
In four seconds of time, the Earth rotates one arc minute on its axis.
originally posted by: Phage
a reply to: bloodymarvelous
In four seconds of time, the Earth rotates one arc minute on its axis.
Please check my math:
86,400 sec/day = 360º/86,400 =0.0417º/sec
Never mind, I checked it myself.
so, strike the rest
0.0417º/sec * 4 sec = 0.1668º
0.1668º = 10.008'
originally posted by: bloodymarvelous
One meter is defined as being exactly one ten millionth the distance from the equator to the North Pole.
So, let's look at this in fours.
Four seconds is 1/60 of a degree of rotation.
originally posted by: FatherLukeDuke
originally posted by: bloodymarvelous
One meter is defined as being exactly one ten millionth the distance from the equator to the North Pole.
Which is completely arbitrary. Why not one 20 millionth or one 5 millionth?
Aside from all the other huge problems, why would the Egyptians possibly come up with exactly the same measure?
So, let's look at this in fours.
What's special about fours?
Four seconds is 1/60 of a degree of rotation.
So?