<date xmlns="http://www.tei-c.org/ns/1.0" when="1829-10-29" calendar="#julian #gregorian">17/29 <choice> <abbr>Oct</abbr> <expan>Octobre</expan> </choice></date><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> Jeudi<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>Incl.</abbr> <expan>Inclinaison</expan> </choice> <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>magn</abbr> <expan>magnétique</expan> </choice>