Re: Polar ceiling sundial

[J Lynes]

Anselmo Perez Serrada wrote -   "Maybe some of you didn't notice that if you lean the mirror towards the South so that it's slope equals half of your latitude then (a small hand-made wedge would do the job quite well) you get a polar sundial on the ceiling, with all its analemmas paralell to the meridian line..."   Surely this would only work if the ceiling is parallel to the mirror?  If the ceiling is horizontal, Anselmo's proposal would work only at the equator. Or am I missing something?   John Lynes