The sunstone theory was first proposed in 1966 by the Danish archaeologist Thorkild Ramskou.

关于（使用）日长石（导航的）理论，最初是由丹麦考古学家托基尔德·拉姆斯库于1966年提出。

Dr Ropars suspects it was being used as a sunstone because the magnetic compasses of the day were thrown out of kilter by iron cannon.

罗帕斯博士怀疑它曾经被当做太阳石使用，因为在白天，磁性罗盘会因为铸铁的大炮失去平衡。