Re: Polar ceiling sundial

[fer j. de vries]

Hi John et al,   The idea by Anselmo is correct.   The mirror is just between the polar axis and the horizontal ceilng and by this the pattern on the ceiling looks like a polar dial.   Best wishes, Fer.   Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat.  51:30 N      long.  5:30 E ----- Original Message ----- From: J Lynes To: Anselmo Pérez Serrada ; Sundial, Mailinglist Sent: Saturday, January 05, 2002 8:59 PM Subject: Re: Polar ceiling sundial 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