gnomon angle

A sundial commission unwrapped for an 80th birthday celebration

A sundial commission for an 80th birthday celebration

The design is a polar sundial, which tilts up at the latitude angle. The happy owner has unwrapped his 80th birthday present from the family.

“My father turns 80 this year and we are looking to commission a sundial in celebration. Is this possible? What’s the process? How long does it take?” When this email appeared in our inbox one day in March of course we wanted to follow it up. It sounded such a lovely suggestion from the family. Later when we learned a little more it looked like a perfect plan. Continue reading


Restoration of a small brass garden sundial from the 1930s

Brass sundial from the 1930s restored with a new gnomonThis small brass garden sundial had lost its gnomon. It is dearly loved by its owner who has known it since childhood, and she wanted to have it restored. As often happens at different times the family moved home and the sundial moved too. Continue reading


What is the declination of the wall for a sundial

The diagram illustrates a method for calculating wall declination.

Knowing the declination of the wall (WD) is important for designing a sundial. The basic calculation is azimuth angle (AA) minus protractor angle (PA) plus 90°. You can repeat your measurements for accuracy. Do ask for help if you are unsure.

“What is the declination of the wall for a sundial?” A stone sculptor asked us just this question recently . It is a good question because you must know the declination if you are making a sundial that is accurate for the wall. The sculptor was not confident about their own measurements and calculations so they asked us for help. Continue reading