Newgrange Summer Solstice Alignment II (Sunset into Mound)

The Winter Solstice sunrise alignment at Newgrange is well known, but there is strong evidence for a Summer Solstice sunset alignment to balance it in the opposite direction as seen from Mound B (Dagda's Mound). From this vantage it is even possible that the entire mound of Newgrange spans a significant calendrical interval around Summer Solstice matching the opposite interval around Winter Solstice with light in the chamber of the monument.

See further discussion of this alignment with this post on the Archaeoastronomy Database Facebook page:
  / 981075125907101  

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Photo of sunset into Newgrange used by kind permission of Anthony Murphy of Mythical Ireland
https://mythicalireland.com/
Map Imagery: Google Earth
Sky Simulation: Stellarium
Horizon Data from David Hoyle of standingstones.org
http://www.standingstones.org/
3D scan of Knowth kerbstone from the Discovery Programme
Light beam footage from OPW and NMS
Music: Ambient String Quartet by LuxeXx

See other related videos:

Earlier video on the Summer Solstice alignment at Newgrange:
   • Newgrange Summer Solstice Alignment  

Video illustrating how the year might have been divided into 16 parts:
   • Dividing the Year - Solstices, Equinoxes, ...  

Light in the Chamber of Newgrange 1/16th of a year pre/post Winter Solstice:
   • Newgrange Light Range  

Kerbstone at nearby Knowth with possible 16 part solar year calendar:
   • Knowth Kerbstone 15 Calendar