RE: A question for the mathematically inclined (Jack Aubert)

2015-02-03 Thread John Goodman
I find this website very helpful for visualizing the changes in daylight over time and latitude. Daylight Hours Explorer http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html > On Feb 3, 2015, at 3:36 PM, sundial-requ...@uni-koeln.de wrote: > > OK, I would also li

Re: A question for the mathematically inclined

2015-02-03 Thread Roger Bailey
Hi Jack, Let me offer the solution to a related question that came up while hiking with friends around the time of the solstice. One friend asked about the changes he had noticed in the times of sunrise and sunset near the solstice. Sunrise kept getting later after the solstice but sunset mini

Two new sundials by Joan Olivares from Otos

2015-02-03 Thread Reinhold Kriegler
Dear sundial friends! Joan Olivares Alfonso has recently created two beautiful sundials. I invite you to have a closer look at them in the end of the following link: http://www.ta-dip.de/sonnenuhren/sonnenuhren-von-freunden/s-p-a-n-i-e-n/joan-olivares-alfonso.html is one of them... Sincer

RE: A question for the mathematically inclined

2015-02-03 Thread Jack Aubert
OK, I would also like to take a turn and ask a question to the mathematically inclined: I have been trying to figure out how to plot the duration of daylight over the course of the year as a function of latitude. (I would generate a curve for each latitude I am interested in.) I believe the