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This method was developed in the 1820s by Friedrich Wilhelm Bessel, a German mathematician and astronomer, and afterwards improved by William Chauvenet.
Thence he passed on to Gotha as director of the Seeberg observatory; nor could he be tempted to relinquish the post by successive invitations to replace F.G.W. Struve at Dorpat in 1829, and F.W. Bessel at Königsberg in 1847.
In 2011, she was elected Fellow of the American Physical Society; and she won a Friedrich Wilhelm Bessel Research Award from the Alexander von Humboldt Foundation for developing robust electronic structure methods for open-shell and electronically excited species, and creative use of ab initio theory to understand the chemistry of bimolecules, reaction intermediates, and photoinduced processes.