“The four station stones outside the Sarsen Circle provide markers to notch-up until a leap day.” Trilithon stones, seen from looking outwards from the inside of the Trilithon Horseshoe.

But the sarsen stones hail from much closer to home. Since the 1500s, most Stonehenge scholars have assumed the sarsen stones came from nearby Marlborough Downs, an area of round, grassy hills 25 ...

He said: "The proposed calendar works in a very straightforward way. "Each of the 30 stones in the sarsen circle represents a day within a month, itself divided into three weeks each of 10 days." ...

According to Professor Timothy Darvill, the eminent archaeologist, each upright sarsen stone in the main circle represents a single day. The entire group of 30, when complete, form a single month.

English Heritage explains that the ancient stone ‘core’ was taken from one of Stonehenge’s huge sarsen stones in 1958. Its whereabouts remained largely unknown for the next 60 years ...

It consists of an outer ring and inner horseshoe of large “sarsen” and “trilithon” stones and an inner circle and horseshoe of smaller “bluestones.” ...

“The sarsen stones make up the iconic outer circle and central trilithon horseshoe at Stonehenge. They are enormous,” said David Nash, a University of Brighton geomorphologist who led the study.

There are two types of stone at Stonehenge - the larger sarsen stones and the smaller ‘bluestones’. The sarsens weigh roughly 25 tons each, with the largest stone, the Heel Stone, weighing ...

WILTSHIRE, ENGLAND—BBC News reports that a three-foot-long core removed from a sarsen stone at Stonehenge in 1958 has been handed over to researchers at English Heritage. The core was one of ...