On 6 September 2003, Mr. Berkhoff and Mrs. Berhkoff-Ormel celebrated their 40th wedding anniversary. Their relatives gave them a sundial.
On the sundial are the co-ordinates of Haren (53°10' N, 6°36' E) and the date: 6 September.
The dial reads apparent time on the straight lines marked with Roman numerals.
Between 12 and 13 hours apparent, there is a figure-of-eight shaped equation-of-time loop. This loop lets you read civil noon.
On the sundial is also the date line for 6 September; this is the thick, curved line from middle lower left to upper right.
On 6 September, the shadow of the tip of the shadow caster follows this line exactly.
The photograph above was thus taken on 6 September, 12.00 hours apparent time.
Design: Hendrik Hollander
Location: Haren, Groningen
English translation: RH