According to Cassini, a degree was 600 stadia, a minute 10 stadia; and a modern Italian mile, in the year 1723, was equal to one and a quarter ancient Roman miles; and one and a quarter ancient Roman miles were equal to ten stadia or one minute. (Cassini, Traite de la grandeur et de la Figure de la Terre. Amsterdam, 1723.)
Fig. 5
| R.B. Cubits. | R.B. Cubits. | ||||
| FB | = | 640 | EB | = | 504 |
| BA | = | 672 | BA | = | 672 |
| AF | = | 928 | AE | = | 840 |
| DC | = | 1080 | NO | = | 768 |
| CA | = | 1440 | OF | = | 1024 |
| AD | = | 1800 | FN | = | 1280 |
| DG | = | 576 | AY | = | 288 |
| GE | = | 768 | ZY | = | 384 |
| ED | = | 960 | ZA | = | 480 |
| R.B. Cub. | ||||
| At level of Cephren's Base which is the plane or level of the plan.— | } | { | Cheops' Base Cephren's Base Mycerīnus' Base | 420 420 218 |
Dufeu also made a stadium the six hundredth part of a degree. He made the degree 110827·68 metres, which multiplied by 3·280841 gives 363607·996+ British feet; and 363607·996+ divided by 600 equals 606·013327 feet to his stadium.
I make the stadium 606·62376 British feet.
There being 360 cubits to a stadium, Dufeu's stadium divided by 360, gives 1·6833 British feet, which is the exact measure given for a Royal Babylonian Cubit, if reduced to metres, viz.: 0·5131 of a metre, and therefore probably the origin of the measure called the Royal Babylonian cubit. According to this measure, the Gïzeh plan would be about 1/1011 smaller than if measured by R.B. cubits.