 Maximilian Hell published the results of his expedition in 1770 , in Copenhagen . Based on the results of his own expedition , and of Wales and Cook , in 1772 he presented another calculation of the astronomical unit : 151 @.@ 7 million kilometers . Lalande queried the accuracy and authenticity of the Hell expedition , but later he retreated in an article of Journal des <unk> , in 1778 . 
