William Hawley
The first of the holes were found by William Hawley - its all in Wiki http://en.wikipedia.org/wiki/Stonehenge also for more up to date info see: http://precedings.nature.com/documents/2153/version/1
The first Stonehenge was a large earthwork or Henge, comprising a ditch, bank, and the Aubrey holes, all probably built around 3100 BC. The Aubrey holes are round pits in the chalk, about one metre wide and deep, with steep sides and flat bottoms. They form a circle about 284 feet in diameter.
Over 200 neolithic people were buried in the Aubrey holes--men,women and children. These were cremation burials. A bronze age man contemporary with the building of the circle was shot by at least 4 arrows and buried at the entrance to the monument.
Holes are usually circular because it is the most efficient shape for evenly distributing stress around the edges of the hole. This helps to prevent cracking or failure in the surrounding material. Additionally, drilling circular holes is easier and more precise compared to other shapes.
Stonehenge was constructed in three main stages. The first stage, around 3000 BC, involved the creation of a circular ditch and bank, along with the placement of the Aubrey holes. The second stage, around 2500 BC, saw the erection of the large sarsen stones and bluestones, forming the iconic stone circle and inner horseshoe. The final stage, around 1600 BC, included additional modifications and the rearrangement of some stones, solidifying Stonehenge's status as a significant ceremonial site.
The formula to calculate the Pitch Circle Diameter (PCD) for a given number of holes is: [ \text{PCD} = \frac{d}{\sin\left(\frac{180^\circ}{n}\right)} ] where ( d ) is the distance between holes (or the diameter of the circle on which the holes are located), and ( n ) is the number of holes. For a PCD of 100 mm with 8 holes, you would use this formula to determine the spacing and arrangement of the holes around the circle.
Yes, you could say this. The holes, however, are irregular and could be described as pockets.
The donut holes are made automatically when the circle is cut from the rolled dough: there is a large outer circle and a small inner circle on the cutter. The holes are either rolled back out or deep fried separately in a basket, as they cannot be "turned" to cook on both sides. Jelly donuts and other "filled" donuts are cut with a plain, large circle cutter, providing the inflated full round shapes. The reason for holes in donuts is that it keeps them thinner when they fry, and the donut is more evenly cooked throughout.
Bgf
The keyword density of black holes is important in understanding their gravitational pull and influence on surrounding matter. A higher keyword density indicates a stronger gravitational pull, which can have a greater impact on nearby objects and matter. This helps scientists study and predict the behavior of black holes and their interactions with the surrounding environment.
No-one knows for certain, but the most recent theory is that Stonehenge is a monument to the dead and that the people who built it actually wanted to build it and be part of the process in making a treasured monument. The most recent archaeological dig didn't find anything to indicate slaves built Stonehenge. However the 'most recent theory; is simply wrong, the Structure that everyone understands as Stonehenge wasn't even built at the time cremations were being casually inserted into the ditch and Aubrey holes of the earlier phase.
As the centre of millions galaxies have one they cannot be described as rare