“The Great Pyramid has lent its name as a sort of byword for paradoxes; and as moths to a candle, so are theorizers attracted to it.”  Flinders Petrie
INTRODUCTION
The Great Pyramid at Giza is the oldest, largest and most accurately engineered building on our planet.
This ancient enigmatic monument has no hieroglyphs, paintings, carvings or records of its construction. No burials, no explanations. Researchers and scholars around the world are still trying to determine exactly who built it, when, how, and why.
It is also the most measured building in the world and from the data obtained, the most analysed.
The first precision measurements were taken by Flinders Petrie in 18802 and verified by J. H. Cole in 1925. Petrie's measurements are official to this day.
They wanted to determine the exact size of the pyramid by measuring the perimeter, estimating the angle and finally, calculating the height.
The ultimate aim was to find the base unit of length used by the ancients, then theorise what this length represents.
Did they succeed?
THE THEORY
"It is hardly necessary to say that where there is a choice of two equally concordant theories, the simpler of the two is the more likely to be the true one."  Petrie.
The perimeter of the Great Pyramid is 1000 yards, exactly one second of the earth's rotation.
Petrie and Cole measured 1007.7 British yards.
Great Pyramid  Design  Petrie  

Yards  Inches  British Yards 
British Inches 

Perimeter  1000  36,000  1007.7  36,277 
Sides  250  9000  251.9  9069 
Note: 1 yard equals 36 inches.
To avoid confusion ancient yards and inches will now be called RaYards and RaInches. Pronounced rayinch.
Could it be that 1 Rainch = 1.0077 British inches?
And the pyramid sides are 9000 inches x 4, which equals 36,000 inches exactly?
360 has 24 divisors and a circle is 360 degrees. All ancient calendars used a 360 day year.
The 24 divisors are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20,
24, 30, 36, 40, 45, 60, 72, 90, 120, 180 and 360.
Could the original Inch have survived perfectly intact after more than 4500 years? Not likely, but the Great Pyramid could have been measurable 1000 years ago. It was a perfect square and only one side needed to be measured.
Unmeasurable until 1880.
For over a thousand years the Great Pyramid was used as a quarry for the beautiful marblelike Tura limestone that encased the monument.
About 135 years ago, Petrie had to dig deep shafts into the massive piles of rubble around the base of the pyramid to find the few remaining casing stones.
In the image below you can see the baseline  where the angle meets the platform. Petrie used that baseline to determine the exact size of the pyramid.
The perimeter is 36,000 inches or 1000 yards.
The four largest and most accurately measured Egyptian pyramids confirms Rainches were utilised.
Pyramid  British 
Rainches  Design  Percent Accuracy 

Great  9068.8  9000.0  9000  100.00 
Giza II  8474.9  8410.6  8400  99.87 
Red  7459.0  7402.4  7400  99.96 
Bent  8661.4  8595.7  8600  100.05 
ANCIENT YARD
Remember, the difference between the ancient yard and the British yard is 0.77%.
The origin of the British Yard is unknown and thought to be created about 1000 years ago.
Archaeologists believe Egyptians and Mesopotamians used the cubit and the Greeks and Romans favoured the foot.
The Cubit is 18 inches or ^{1}⁄_{2} yard. ("a Foot and a half"  Isaac Newton.)
A Foot is 12 inches or ^{1}⁄_{3} yard.
The Egyptian/Greek/Roman yard was introduced to Britain during 1st century AD.
During the last 500 years England didn't look after her 36 inch yardsticks very well.
At least 10 different Standard Yardsticks were used during this period due to fires, wear, neglect, damage and change of monarchy.
In 1880, Petrie calibrated his measuring tools to the Royal Society brass "Standard Yard 1760".
CIRCUMFERENCE OF THE EARTH
"Now that we are furnished, for the first time, with an accurate knowledge of the ancient dimensions of the Pyramids we can enter on an examination of the theories which have been formed, and test them by the real facts of the case."  Petrie
Sir Isaac Newton could not complete his Theory of Gravitation until he knew the circumference of the earth which he discovered was enshrined in the proportions of the Great Pyramid.
During the years 163782, Tito Burattini, an Italian architect, Egyptologist, scientist and engineer, measured the base of the Great Pyramid of Giza four times. He and Newton used these measurements in an attempt to determine the precise dimensions of the Earth.
Due to massive amount of debris around the base, Tito's measurements were not acceptable to Newton. His theory had to wait.
Was Newton correct? Did we eventually find the earth's circumference in the pyramid dimensions?
Yes, the perimeter of the Great Pyramid is 1000 yards, exactly one second of the earth's rotation.
What is a second of time?
Periods of time, Hours and Seconds, are derived from the Earth's daily rotation.
In modern times we divide the day into 24 units called Hours.
The Hour is further divided into 60 Minutes of 60 Seconds. The same as dividing degrees in a circle.
86,400 seconds in a modern day.
The ancient Egyptian, Mesopotamian, Indian and Chinese divided the day into 12 units.
Why 12?
You have to look at the sky to determine time  the daily rotation and yearly orbit.
Originally, their year was timed by the 12 full moons and called lunisolar calendars.
For better accuracy the yearly orbit was divided into 12 units of 30 degrees called Months, and visualised by the constellations in the sun's ecliptic.
Naturally, the 360° sky has always been divided into 12 equal sections.
The exact same 12 divisions was used to measure the daily rotation. i.e. 12 hours per day not 24.
The resulting Hour and Second was twice as long as ours.
43,200 seconds in the ancient day.
Again, the same 12 divisions are used to measure Precession of the Equinoxes  the Great Year.
We are currently precessing into the Age of Aquarius, from Pisces.
What is a Yard?
The original units of length, Yards, are also derived from the Earth's rotation, and Time.
Divide the equatorial distance travelled in 1 second by 1000 and call it a Yard.
The rotational velocity of the earth was exactly 1000 Rayards/sec.
Note: 1 Rayard equals 1.0077 British yards.
43,200s x 1000Ry x 1.0077 = 43,532,640 British yards.
This calculates to a 39 806 km equatorial circumference, about 99.3% correct.
The Great Pyramid’s perimeter is 1000 Yards,
exactly one second of rotation.
A closer look at the math.
The Great Pyramid's base is 2 secs of rotation using modern time or 1 sec of rotation using the ancient second.
Modern
The circumference of the Earth is 40,075,000 metres
divided by 86,400 seconds in a day
equals 463.8 metres/sec or 507.25 British yards/sec
2 secs of rotation equals 1014.5 British yards.
The Pyramid's base is 1007.7 British yards.
99.3%
Ancient
43,200 secs in a day and 1 sec of rotation gives the same result.
99.3 %
Converting British yards to Rayards also gives the same result. It's just a ratio.
99.3%
If Newton was correct then 99.3% is an excellent result.
The pyramid builders knew the Earth's size, shape and speed of spin.
THE PYRAMID SYMBOLISES A CIRCLE  THE EARTH
A circle with a 1000 yard circumference has a radius of 159.15 yards. R = C/(2π)
Petrie calculated the Great pyramid's height to be 160.38 British yards or 159.15 Rayards. (5776.0 ± 7.0 inches)
43,200 is the scale of the Great Pyramid to the Earth.
43,200 seconds in the ancient day.
43,200 x 1000 yards = earth's circumference.
WORLD STANDARD
The Yard was the ancient unit of length, derived from the circumference of the earth, a rock solid standard of measure.
The Great Pyramid is a monument designed to perpetuate this hard won information. Proudly displayed for all the world to see and measure.
We nearly lost this information despite the amazing efforts of the ancient pyramid builders.
All the ancient civilisations used the equatorial circumference of the earth as a natural, universal unit of measurement: Egypt, Mesopotamia, Indus Valley, China, Mesoamerica, etc.
For all people and for all time.
The Pyramid of the Sun at Teotihuacán, Mexico also has a 1000 yard perimeter.
During all the centuries of darkness experienced by Western civilisation when knowledge of our planet’s dimensions was lost to us, all we needed to rediscover that information was to measure the base perimeter of the Great Pyramid then multiply by 'seconds' in a day.
This used to be common knowledge. Isaac Newton knew it.
The Metre  1.094 yards
After the pyramid was destroyed, and believed to be unmeasurable, a race was on to find a new standard.
In 1791, the newly created French Metre was also a fraction of the earth's circumference.
FINAL THOUGHTS
What are futuristic ruins doing so far in the 'primitive' past? Not just in Egypt but worldwide.
Knowledge of the amazing civilisations that thrived on our planet has mostly been lost and forgotten but the physical evidence is still abundant.
Our incredibly advanced ancestors who built the pyramids knew information we have yet to discover. There is over 8000 tonnes of precision cut granite blocks inside the Great Pyramid!
"Ye canna cut grrranite with copper."
Thanks to Flinders Petrie and the few remaining casing stones, knowledge of the base unit of length used by the ancients, the Yard, has survived.
Go to Part 2  The Pyramids and the Stars