[Roger Hunter]

(10-07-2016, 11:52 AM)Duffy Wrote: Note .................. I finally figured it out, this location is the source of the posted images. I didn't take into account, lines of longitude curve at polar regions on a 2D map . Svalbard was coming into daylight at the time stated in image 27th Sept, and the sun/moon were on the same line of longitude during the time the dome structure developed in image 30th Sept.... Hope this doesn't give cause for another blushing smiley !

Duffy  (11:52 ut 7th Oct)

Duffy are you taking the sun's latitude into account? It makes a huge difference in where the 90 degree radius circle falls.

Roger