Errata in
Astron. Nachr. **331**(8), 852–861 (Sept. 2010):

- Sec. 2, para. 1: replace “radius of curvature
by
*R*” by “radius of curvature be*R*”. - Sec. 2, 4th last eq.: use the partial derivative in place of
“d
*U*/d*p*”. - Some links were omitted:
- Bessel's original paper: doi: 10.1002/asna.18260041601; facsimile: http://adsabs.harvard.edu/full/1825AN......4..241B.
- Clairaut's paper (footnote 6): http://books.google.com/books?id=GOAEAAAAQAAJ&pg=PA406.
- Legendre,
*Exercices de Calcul Intégral*, Vol 1 (footnote 14): http://books.google.com/books?id=riIOAAAAQAAJ. - von Müffling's paper (footnote 21): http://adsabs.harvard.edu/full/1823AN......2...33V.

Errata in arXiv:0908.1824v2 (Feb. 2010) [these have been corrected in arXiv:0908.1824v3, (Mar. 2010)]:

- Footnote 1: the initial quotation marks on “du Séjour's method” are the wrong way round.
- Sec. 2, para. 1: replace “the azimuth of line directed” by “the azimuth of the line directed”.
- Sec. 2, para. 1: replace “radius of curvature
by
*R*” by “radius of curvature be*R*”. - Sec. 2, 4th last eq.: use the partial derivative in place of
“
*dU*/*dp*”. - Page 5, col. 2, line 2: replace “adding the first term in the series” by “adding the next term in the series”.
- Sec. 9, para. 1: replace “Thus it not possible” by “Thus it is not possible”.

Charles Karney <charles@karney.com> (2011-07-29)