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Sundial Type↕ | Orientation↕ | Era of Origin↕ | Accuracy↕ | Known For↕ |
|---|---|---|---|---|
Horizontal Sundial | Flat on ground, gnomon angled to latitude | Ancient Greece/Rome | ±1-2 minutes with corrections | Most common garden sundial, sits on a pedestal, gnomon angle equals latitude, classic park ornament |
Vertical Sundial | Mounted on south-facing wall | Medieval Europe | ±2-5 minutes | Found on church walls across Europe, painted or carved, 'scratch dials' on medieval churches |
Equatorial Sundial | Dial plate parallel to equator | Ancient (various) | ±1 minute | Equally spaced hour lines (simplest math), armillary sphere variant, elegant ring design |
Analemmatic Sundial | Flat on ground, human as gnomon | 17th century Europe | ±5-10 minutes | Person stands on date marker to cast shadow, interactive public art, found in parks and plazas |
Armillary Sphere | Nested rings representing celestial circles | Ancient Greece (3rd century BCE) | ±2-3 minutes | Beautiful astronomical instrument, shows ecliptic and equator, garden sculpture centerpiece, Portuguese national symbol |
Obelisk (Gnomon) | Vertical pillar, shadow on ground | Ancient Egypt (3500 BCE) | ±15-30 minutes | Oldest known sundial type, Egyptian obelisks served dual purpose, Augustus brought one to Rome as war trophy |
Hemicyclium | Hollowed-out hemisphere, nodus tip shadow | Ancient Greece (Berossus, 3rd c. BCE) | ±5 minutes | Attributed to Babylonian priest Berossus, shadow moves across curved surface showing hour and season |
Polar Sundial | Dial plate parallel to Earth's axis | Renaissance Europe | ±1-2 minutes | Gnomon lies flat on the dial plate, equally spaced hour lines like equatorial, used on building walls |
Portable Ring Sundial | Handheld ring aligned to sun | Medieval Europe (9th-10th century) | ±10-15 minutes | Traveler's pocket watch before clocks existed, small brass ring with hole, hang from a string to read time |
Shepherd's Dial (Pillar Dial) | Vertical cylinder held upright | Medieval Europe | ±15-20 minutes | Simple cylinder with horizontal gnomon, rotated to current month, used by shepherds and farmers in the field |
Diptych Dial | Folding tablet with string gnomon | 15th-16th century (Nuremberg) | ±5-10 minutes | Ivory or wood folding pocket sundial, Nuremberg was manufacturing center, string gnomon doubles as compass plumb |
Reflection Sundial | Mirror reflects sunspot onto ceiling/wall | 17th century Europe | ±1 minute | Uses a small mirror in a window to project light onto interior ceiling, meridian lines in churches, noon markers |
Cross Sundial | Multiple faces on a cross-shaped pillar | Medieval churchyards | ±5-10 minutes | Found atop stone crosses in churchyards, multiple dials face different directions, serves entire village |
Digital Sundial | 3D-printed lattice casts digit shadows | 1994 (patent), 2010s (3D printed) | ±10 minutes (in 20-min intervals) | Fractal-like structure projects actual numerals as shadows, mathematical marvel, Hans Scharstein invention |
Noon Cannon Sundial | Lens focuses sunlight onto cannon fuse | 18th century France | Exact noon only | Fires a miniature cannon at solar noon using focused sunlight, Palais Royal Paris had one, theatrical timekeeping |
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