made by Bernhard von Lindenau at Seeburg between 1812 and 1814; he calculated it to be 470 ±510 mas. Von Lindenau had already noted that he had seen no parallax, and as Friedrich Georg Wilhelm von Struve pointed out after his own test series between 1818 and 1821, all of these numbers are more accurate than the accuracy of the instrument used.

Friedrich Wilhelm Bessel made a