A hypothesis on the Royal Cubit (1 reply)

I have developed a hypothesis regarding the Royal Cubit, which rather than being a biometric measure of the reigning Pharoah, was a measure of an astronomical event. The Ancient Egyptians knew of a constellation “The Giant”. In Stellarium, which has a built in star lore for Ancient Egypt, the Giant appears to wear the crown of Lower Egypt:



This has led me to wonder whether the Royal Cubit could be defined in terms of the distance from forearm to finger of the giant as observed by an astronomer. The tool used by the ancient egyptian astronomers was essentially a plumb bob called the Merkhet along with a sighting tool known as a Bay. A description of how they were used is below from DT Online refer to
[wiki.dtonline.org]

Quote
DT Online Ancient Egyptian Survey Tools
Text and illustrations of the time suggest that the Merkhet was used to mark where a particular star would sink below the horizon and then reappear later (in much the same way as our nearest star, the Sun, sets and rises each day - a good candidate for such a star at that time would have been Vega although b-Ursae Minoris and z-Ursae Majoris have also been put forward). One person would have stood at an observation point and sighted the falling (or rising) star through a narrow slit in a palm leaf, known as a Bay. A second person could move until a Plum Bob suspended from a Merkhet crossed the line of sight and then mark a point on the ground. This process would be repeated to create an angle between where a star rises and where it falls. Bisecting this angle would always give a true North

It seems to me that to confirm or deny this hypothesis would require an experiment to be undertaken in egypt during the months that the constellation is visible, looking at the distance marked out on the ground between the different stars, or is there an alternative method?