Monolith at Gardom's Edge

Designated Britain's first National Park in 1951, the area has two distinct landscapes. In the south are the gently rolling hills of the limestone White Peak. To the north, west and east are the wild, heather-clad moorlands of the Dark Peak peat bogs, superimposed on millstone grit. Predominantly in Derbyshire, parts of the national Park also extend into the neighbouring counties of Staffordshire, Greater Manchester, Cheshire, South Yorkshire and West Yorkshire.

Wikipedia...

Gardom's Edge is located near Baslow in Derbyshire, England.

In March 2012, Daniel Brown et al postulated that a standing stone at Gardom's Edge could be a gnomon of a seasonal sundial (indicating the change of season, as through the winter half of the year its north facing side is in permanent shadow) possibly dated to during the late Neolithic and early Bronze Age period (2500 – 1500 BC).

Abstract:

A unique triangular shaped monolith located within the Peak District National Park at Gardom's Edge could be intentionally astronomically aligned. It is set within a landscape rich in late Neolithic and Bronze Age remains. We show that the stone is most likely in its original orientation owing to its clear signs of erosion and associated to the time period of the late Neolithic. It is tilted towards South and its North side slopes at an angle equal to the maximum altitude of the Sun at mid-summer. This alignment emphasizes the changing declinations of the Sun during the seasons as well as giving an indication of mid-summers day. This functionality is achieved by an impressive display of light and shadow on the North-facing side of the Monolith. Together with other monuments in the close vicinity the monolith would have represented an ideal marker or social arena for seasonal gatherings for the else dispersed small communities.

"A POSSIBLE ASTRONOMICALLY ALIGNED MONOLITH AT GARDOM'S EDGE" by DANIEL BROWN, ANDY ALDER, and ELIZABETH BEMAND