Sundials of the World!
The horizontal sundial
presented on this page is located at Science North in Sudbury, Ontario.
This sundial, called Celeste, as well
as the globe segment Terra were both designed by Tom Semadeni and
installed in the spring of 1994.
and information were supplied by Science North.
|This image shows Science North and
Polaris Boulevard from the air. Polaris Boulevard sits in the
centre of the photo. The photo is looking due north and the
line of light-coloured interlocking brick at the centre of the
walkway marks a due North-South line (longitude 80° 59'
45.70"). Celeste is the large stainless steel sundial at
the near end of Polaris Blvd. The dome of Terra sits between
Celeste and the main doors of Science North.
Polaris Boulevard is the main
entrance walkway to Science North. The centre line of Polaris
Boulevard (indicated by the lighter bricks) runs due north and
perfectly bisects the main Science North exhibit
|In this photo you can see the main
stainless steel building on the hill in the background. The
centre of the sundial neatly divides the building into two
Why is it called Polaris
At night, if you stand on the
North-South centre line of Polaris Boulevard (marked with
lighter interlocking bricks) and look skyward due north over
the science centre building, you will see Polaris, the North
Star. It will be directly over the tall spire on top of the
main exhibit building, at an angle of 46.5°, the latitude of
Sudbury. (The spire is hidden in the photo by Celeste, the
large sundial. It wouldn't show up anyway, since it is very
thin.) There are two astronomical tools on Polaris Boulevard:
Celeste, the large stainless steel sundial, and Terra, a
segment of the globe oriented with Sudbury directly at the
Celeste is a
large stainless steel sundial at the south end of Polaris
Blvd. The gnonom is inclined at an angle of 46.5°, the
latitude of Sudbury.
hour markings are for local standard time.
located between Celeste and the front doors of Science North.
The benchmark at the centre of Terra is: 46° 28' 12.00"
N & 80° 59' 45.70" W. This view is of Terra from
Celeste, looking due north up Polaris Boulevard. Terra sits as
a shallow 'hump', showing just a portion of the globe with
Sudbury at the very top. This is just the way one perceives
the world. You are always at the top - the earth slopes away
from you in all directions, wherever you are. A small brass
ring marks the position of Sudbury. The main graticule is
marked off in 10 degree increments with inlaid stainless steel
strips. The one exception is longitude 81° W which runs
through Sudbury and almost directly through Science North (it
is actually about 200 m to the west, running through the Lily