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References
1.
Thom
A.
and
Thom
A. S.
, “A Megalithic Lunar Observatory in Orkney: The Ring of Brogar and its Cairns” , Journal for the history of astronomy , iv (1973 ), 111 –23 . A printing error in Figure 1 gave an incorrect latitude for the Ring; its value is 59°00′·1 and not 50°00′·1.
2.
Thom
A.
, Megalithic lunar observatories (Oxford , 1971 ), 18 .
3.Ibid .
4.
Thom
, Megalithic lunar observatories , 2.6 .
5.
Thom
, Megalithic lunar observatories , Figure 7.2.
6.
Thom
A.
Thom
A. S.
and
Thom
A. S.
, “Stonehenge as a Possible Lunar Observatory” , Journal for the history of astronomy , vi (1975 ), 19 –30 .
7.
Thom
, Megalithic lunar observatories , p. 86 .
8.Ibid. , chap. 8.