In 1906 Norman Lockyer said that Bryn Celli Ddu marked the summer solstice. This was made fun of at the time, but research by Christopher Knight and Robert Lomas in 1997- 98 showed it was true. They also say the site can be used as an agricultural calendar. Steve Burrow, curator of Neolithic archaeology at Amgueddfa Cymru (National Museum of Wales), has more recently supported the case for summer solstice alignment. This alignment links Bryn Celli Ddu to other sites, including Maes Howe and Newgrange, both of which point to the Winter solstice. It has also been suggested that a feature similar to the 'lightbox' at Newgrange may be matched at Bryn Celli Ddu (Pitts, 2006).