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Sundial Hour Lines Lay out

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Declination Lines of Sundials

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Interesting Sundials of the World

LAYING OUT THE SUNDIAL HOUR LINES - Page 20

The SUBSTYLE is to be determined. (The substyle is not the 12 o'clock line in this type of sundial). The HEIGHT OF THE STYLE is to be determined. Setting the Reclining Sundials Care must be used to set the sundial in the position for which it was computed. The 12 o'clock line will be near the bottom of the sundial and must lie in the plane of the meridian and parallel to the plane of the horizon. RECLINING-DECLINING SUNDIALS PLATE IX We have had but one inquiry in the last twelve years about the construction of these sundials, but the book would not be complete without them. The Reclining-Declining sundials neither face any of the cardinal points of the compass, nor do they stand upright. Three things must be known before the hour lines can be laid out the height of the style, the substyle distance, and the angle which the meridan (12 o'clock line) makes with the horizon. (The declination and reclination may be found by one of the methods described in Section V). The GNOMON is perpendicular to the face of the sundial. The STYLE points to the celestial pole. The SUBSTYLE is to be determined (The substyle is not the 12 o'clock line in this type of sundial.) The HEIGHT OF THE STYLE is to be determined. The MERIDIAN LINE is to be determined (The meridian or 12 o'clock line makes an angle with the horizon in this type of sundial.)

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