RESEARCH BASE

Search 3,721 documents across 34 fields — every claim tier-rated by evidence

3,721 Documents 34 Sections 43,625 Citations 34,852 Keywords Indexed 4 Evidence Tiers

3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.

8 results for "gnomon"

ZH_1_08 Verified Archaeoastronomy

ZH_1_08 — Sundials, Gnomons, and Ancient Timekeeping Devices

The gnomon — a vertical stick, pillar, or edge that casts a shadow — is arguably the oldest scientific instrument in human history, requiring nothing more than a straight object placed in sunlight to measure time, determ

sundial gnomon horologium scaphe hemicyclium shadow clock

ZH_5_10 Verified Archaeoastronomy

ZH_5_10 — Naked-Eye Observational Limits: Precision, Techniques, and Ancient Achievement

For all but the last ~400 years of human history, every astronomical observation was made with the unaided eye. Understanding the limits and capabilities of naked-eye observation is therefore essential for evaluating anc

naked-eye observation visual acuity atmospheric refraction limiting magnitude angular resolution Tycho Brahe

ZH_2_10 Credible Archaeoastronomy

ZH_2_10 — Astronomical Alignments in Medieval Architecture: Cathedrals and Mosques

Medieval cathedrals and mosques — two of the most ambitious architectural traditions in history — both incorporate astronomical considerations into their design, though in different ways and for different reasons. Christ

medieval astronomy cathedral orientation mosque qibla meridiana gnomon church alignment

ZH_2_01 Verified Archaeoastronomy

ZH_2_01 — Chinese Astronomical Records: Supernovae, Comets, Guest Stars

China produced the longest continuous tradition of systematic astronomical observation in human history — spanning from the Shang dynasty oracle bone inscriptions (c. 1200 BCE) through the imperial astronomical bureaus o

Chinese astronomy guest star supernova comet Halley's Comet SN 1054

ZH_1_12 Verified Archaeoastronomy

ZH_1_12 — Astronomical Instruments: Astrolabe, Armillary, Quadrant

The history of astronomical instruments — devices for measuring the positions, motions, and timing of celestial bodies — is inseparable from the history of astronomy itself. From the gnomon (the simplest shadow-casting s

astrolabe armillary sphere quadrant sextant gnomon sundial

J_3_04 Verified Ancient Technology

J_3_04 — Egyptian Obelisks — Quarrying, Transport, and Solar Alignment

Egyptian obelisks — monolithic shafts of red granite quarried primarily at Aswan — represent extraordinary feats of quarrying, transport, and precision engineering spanning over two millennia of pharaonic history. The Un

obelisk Aswan unfinished obelisk quarrying dolerite Hatshepsut

J_5_05 Verified Ancient Technology

J_5_05 — Ancient Timekeeping Devices

The measurement of time — dividing the day, tracking seasons, and scheduling ritual observances — was a foundational technological challenge solved independently by civilizations worldwide using shadow, water, fire, and

sundial water clock clepsydra gnomon shadow clock incense clock

J_5_08 Verified Ancient Technology

J_5_08 — Ancient Astronomical Instruments

Before the invention of the telescope (1608 CE), astronomical observation relied entirely on naked-eye instruments — devices for measuring the angular positions of celestial objects, tracking their motions, and computing

astrolabe armillary sphere gnomon quadrant torquetum equatorial ring

BROWSE BY SECTION — 3,721 documents across 34 fields

A Foundations 112 Docs B Beings & Entities 114 Docs C Global Traditions 116 Docs D Sites & Artifacts 116 Docs E Cataclysms & Chronology 109 Docs F Lost Connections 111 Docs G Modern Frameworks 99 Docs H Suppression & Thesis 95 Docs I UAP Disclosure 87 Docs J Ancient Technology 103 Docs K Consciousness 105 Docs L Genetics & Origins 92 Docs M Forbidden Archaeology 103 Docs N Secret Societies 87 Docs O Earth Anomalies 108 Docs P Philosophy & Meaning 104 Docs Q Cosmology & Physics 100 Docs R Biology & Evolution 95 Docs S Future Technology 100 Docs T Psychology & Social 112 Docs U Art, Music & Culture 122 Docs V Mathematics & Information 87 Docs W World Civilizations 140 Docs X Medicine & Healing 126 Docs Y Altered States 108 Docs Z Molecular Biology 112 Docs ZA Physics & Quantum 117 Docs ZB Ecology & Biology 117 Docs ZC Social Science 111 Docs ZD Information & Computation 96 Docs ZE Ethics & Applied Philosophy 99 Docs ZF Oceanography 105 Docs ZG Linguistics & Communication 110 Docs ZH Archaeoastronomy 114 Docs