RESEARCH BASE

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

3,721 Documents 34 Sections 43,623 Citations 34,854 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.

7 results for "portolan"

M_5_03 Verified Forbidden Archaeology

M_5_03 — Piri Reis Map and Cartographic Anomalies

The Piri Reis map is a fragment of a world map drawn on gazelle parchment by the Ottoman admiral and cartographer Piri Reis (Ahmed Muhiddin Piri) in 1513 CE, rediscovered in the Topkapi Palace library, Istanbul, in 1929.

Piri Reis portolan chart Ottoman 1513 Antarctica coastline

ZF_3_05 Oceanography

ZF_3_05 — Ancient Maritime Navigation and Wayfinding

Long before the compass, sextant, or chronometer, ancient maritime cultures navigated thousands of miles of open ocean using sophisticated systems of environmental observation — star paths, ocean swell patterns, wind shi

Polynesian wayfinding star compass wave piloting Marshall Islands stick chart celestial navigation dead reckoning

J_5_09 Verified Ancient Technology

J_5_09 — Ancient Cartography and Mapmaking

The representation of geographical space in graphic form — cartography — is attested from deep antiquity and represents a fundamental intellectual achievement: the abstraction of three-dimensional lived space into two-di

cartography ancient map Ptolemy Geography Tabula Peutingeriana Imago Mundi

J_5_01 Ancient Technology

J_5_01 — Ancient Navigation Instruments — Astrolabe, Sunstone, and Star Compass

Ancient and medieval navigators developed remarkably sophisticated instruments and techniques for traversing oceans, deserts, and vast territories — millennia before GPS, chronometers, or modern charts. This document sur

navigation astrolabe sunstone star compass Polynesian stick chart

F_4_03 Lost Connections

F_4_03 — Ancient Maritime Technology and Naval Knowledge

The history of maritime technology reveals that ancient civilizations achieved levels of nautical engineering and navigational skill far exceeding common assumptions. Phoenician sailors may have circumnavigated Africa ~6

maritime technology ancient ships sailing navigation shipbuilding dhow

F_4_02 Lost Connections

F_4_02 — Ancient Maps and Impossible Cartography

A handful of historical maps appear to depict geographic features that, according to conventional history, were unknown at the time of their creation. The Piri Reis Map (1513) shows what may be the coastline of Antarctic

Piri Reis Oronteus Finaeus Buache portolan Antarctic Hapgood

F_3_21 Verified Lost Connections

F_3_21 — Compass Navigation and Its Global Spread

The magnetic compass — one of China's "Four Great Inventions" — transformed navigation from a coastal, celestial, and dead-reckoning art into an all-weather, open-ocean capability. [KEY FINDING] The earliest confirmed re

compass-navigation magnetic-compass chinese-invention maritime-navigation lodestone geomancy

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 100 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 94 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 113 Docs Z Molecular Biology 112 Docs ZA Physics & Quantum 117 Docs ZB Ecology & Biology 118 Docs ZC Social Science 111 Docs ZD Information & Computation 95 Docs ZE Ethics & Applied Philosophy 99 Docs ZF Oceanography 105 Docs ZG Linguistics & Communication 110 Docs ZH Archaeoastronomy 114 Docs