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Hello everyone!
I am constructing my first sundial
in my garden. I am having a problem finding true north.
"The Dialist" computer
progream tells me that solar noon is at 11:53.
The shadow method tells me that
solar noon is 12:43ish.
I also employed the compass method
and also I tried finding north by looking at the "north star".
The direction for true north is
different for each of the methods I try.
Yesterday I laid out the sundial
using the direction of true north I found using the compass method. The latitude
here is 47.0019 degrees N. Longitude is 117.0854 degrees W. Apparently the
declination is 15 - 16 degrees here. So I compensated for that (I lined up true
north 16 degrees to the left of magnetic north).
Today I tested the sundial, and it
seemed that each hour was off by one hour....1:00 pm on the clock shows 12:00 pm
on the dial; 12:00 on the clock shows 11:00 am on the dial; and so on.
I used a MS Excel spread sheet that
I found on the internet to calculate the hour placements and date scale
placement - corrected for longitude.
I would appreciated any help at
all. Thank you.
Tracy
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