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Ordering Information: Please contact wkerkhof@antiqueclocks.nl

Horizontal and Analemmatic sundial adjust 1Click on pictures for large view
Individually made on demand for your geographic latitude.

1: Horizontal & Analemmatic Sundial:

This dial can be ordered custom made for your latitude. The dial example here has a latitude of 52.0°. To see how both dials are affected by a change of latitude look at the animation below.

Horizontal and Analemmatic sundial animation

2: Adjustments before use:

1. Adjust the relative position in your timezone by turning the wheel in Timezone aperture. For example: My co-ordinates are 4.6° east and 52.0° North. My timezone is CET and is GMT+1. A timezone is 15° wide (24 timezones --> 24 x 15 = 360°).
The CET meridian is GMT+1 = 0° + 1 x 15° = 15°
My relative position in my timezone is 15° - 4.6° = 10.4° West (Notice that on the pictures East and West are wrong and needs to be swaped)

Horizontal and Analemmatic sundial adjust 2

2. Adjust the Daylight-Saving by turning the wheel in Daylight-Saving aperture.

Horizontal and Analemmatic sundial adjust 3

3. Turn the outer ring (Date-Ring) on the current date. By turning the Date-Ring, 2 further adjustments are done automaticly, the equation correction and the analemmatic dial (upper dial) moves to the right position. The vertical gnomon corresponds always with the date in the Date-Ring. The equation correction is automaticly added or subtracted in the final timezone calculation.

Horizontal and Analemmatic sundial

4. Turn the compass until the arrow corresponds to your local Magnetic Declination. (when the sun shines, the dial is automaticly in North position when the shadows of both gnomons give the same time. Only the date must be set and the the dial must be levelled horizontal. This way arround, one can also find the Magnetic North and your local Magnetic Declination.

3: Use of the sundial:

When levelled and in North position both dials give the local Solar-time on their scales. In the aperture under the XII you see the hours and minutes that have to be added or subtracted by the local Solar-Time to get the time that corresponds with your watch and clocks, the timezone time. In my example the date is March-24 and to get my timezone time I have to add 47 minuts to the sundial Solar-Time. (for example: when the sundial shows 10:45 the time in my timezone is 10:45 + 00:47 = 11:32)

Horizontal and Analemmatic sundial adjust 5

4: Dimensions: length = 42cm (16.5"), wide 25.5cm (10"), height: depends on the latitude.

5: Construction: The dial has 5 interactive layers and is made from 2 and 3 mm hard Resopal, brass and stainless steel. The Resopal is very hard and inflexible. It has 2 levelling srews and 2 adjustable gnomons. The gnomons are fixed to an arm that keeps tension on the 2 gnomon strings. The arm can be lowered down for fitting the box. The dialplates are drawn in a selfwritten computer program and then CNC-engraved and cut.

Horizontal and Analemmatic sundial adjust 1

6: Gnomon adjustments: The 2 gnomons can be individualy adjusted. The length is altered by turning the srew with a small srewdriver in the bottom. Remember that every change on one gnomon does influence the angle of the other. On delivery the gnomons are correcly adjusted and do not need further attention.

Horizontal and Analemmatic sundial adjust 1 Horizontal and Analemmatic sundial adjust 1

7: Options: Dial text in your own language. Your own additional text (example: your name, your town, your estate name)

8: Included: Resopal gnomon mesurement tool, Resopal adjustment srewdriver.

Horizontal and Analemmatic sundial adjust 1

9: Price: € 1250,- + shipment (for EU deliveries only: add 21% VAT)

10: Delivery: Please contact for delivery time and conditions.

11: Ordering Information: Please contact wkerkhof@antiqueclocks.nl