A Conversation for Sundials
up the wall
Taff Agent of kaos Started conversation Oct 25, 2007
How do you set up a sundial that is vertical on a wall??????
up the wall
Gnomon - time to move on Posted Oct 26, 2007
The wall should be south facing (assuming you're in the Northern Hemisphere).
Find out your latitude from a map or atlas and subtract it from 90.
The gnomon should point downwards and the angle between the gnomon and the wall should be this angle.
If the wall isn't south facing, it's going to be more complicated. The shadow-casting line of the gnomon has to be parallel to the axis of the earth, so you'll have to use a bit of geometry to work it out.
Key: Complain about this post
up the wall
More Conversations for Sundials
Write an Entry
"The Hitchhiker's Guide to the Galaxy is a wholly remarkable book. It has been compiled and recompiled many times and under many different editorships. It contains contributions from countless numbers of travellers and researchers."