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Search 3,721 documents across 34 fields — every claim tier-rated by evidence
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.
3,721 results for "T cell" — page 33 of 187
ZH_3_15 — Norse Astronomy: Sunstones, Aurvandil's Toe, and Viking Celestial Navigation
The Norse/Viking world (c. 800–1100 CE) developed a distinctive astronomical culture shaped by extreme northern latitudes — long summer days with no true darkness, short winter days with extended night, the aurora boreal
ZH_3_18 — Polynesian Star Navigation and Wayfinding
Polynesian star navigation is the non-instrument celestial wayfinding system that enabled the colonization of the Polynesian Triangle — the vast oceanic region bounded by Hawaiʻi, Rapa Nui (Easter Island), and Aotearoa (
ZH_3_03 — Aboriginal Australian Astronomy: Seasonal Star Knowledge
Australian Aboriginal peoples developed one of the oldest continuous astronomical traditions on Earth — an integrated system of sky knowledge extending back at least 50,000 years of habitation on the Australian continent
ZH_3_09 — Solar Geometry in Pueblo Architecture: Mesa Verde, Hovenweep
The Ancestral Puebloan peoples (formerly termed "Anasazi") of the American Southwest incorporated sophisticated solar geometry into their architecture, settlement planning, and ceremonial life across a vast region center
ZH_3_13 — Women in Astronomy: Hypatia, Caroline Herschel, Henrietta Leavitt
Women have contributed to astronomy from antiquity to the present — often against formidable institutional barriers, many of which persisted well into the 20th century. Hypatia of Alexandria (~355–415 CE) was a renowned
ZH_3_21 — Chankillo Solar Observatory
Chankillo (also spelled Chanquillo) — a monumental archaeological complex in the Casma-Sechín Valley of coastal Peru, approximately 380 km north of Lima — contains the oldest known solar observatory in the Americas and o
ZH_3_14 — Nighttime Navigation Without Instruments: Stars, Moon, and Memory
For most of human history, navigators crossing deserts, oceans, and arctic wastes found their way using the stars, the Moon, the Sun's position, and memory — without magnetic compasses, chronometers, or sextants. Non-ins
ZH_5_17 — Ancient Variable Star Observations (Algol)
Algol (Beta Persei, the "Demon Star") — a second-magnitude eclipsing binary star in the constellation Perseus that dims dramatically every 2.867 days as its fainter companion transits the primary star — may have been rec
ZH_5_15 — Astronomical Symbolism: Stars, Crescents, and Suns in Heraldry and Currency
Astronomical symbols — stars, crescents, and suns — are among the most universal and enduring elements in human visual culture, appearing on the flags of over 70 nations, on coinage from the earliest electrum staters of
ZH_5_24 — Zoroastrian Astral Cosmology and Fire-Temple Astronomy
Zoroastrianism — one of the world's oldest continuously practiced religions, founded by Zarathustra (dates debated: c. 1500–600 BCE) in Greater Iran — embedded astronomical observation deeply into its cosmology, calendar
ZH_5_12 — Citizen Astronomy: Variable Star Observers to Exoplanet Hunters
Astronomy is one of the very few sciences where non-professional observers — amateurs, hobbyists, and citizen scientists — continue to make significant, publishable contributions to research alongside professionals. This
ZH_5_09 — Ancient Observatories: Kokino, Goseck, and Pre-Stonehenge Horizon Sites
Stonehenge is the world's most famous archaeoastronomical site — but it is neither the earliest nor the only ancient structure demonstrating systematic astronomical observation. Across Europe, the Near East, and Africa,
ZH_5_05 — Cross-Cultural Constellation Patterns: Connecting Star Groupings Worldwide
Every documented human culture groups stars into constellations or asterisms — named patterns that organize the sky into a readable, memorizable, and culturally meaningful map. Yet surprisingly few star groupings are uni
ZH_5_21 — Precession of the Equinoxes: The Great Year and Ancient Awareness
The precession of the equinoxes — the slow westward drift of the vernal equinox point along the ecliptic, completing a full cycle in approximately 25,772 years (the "Great Year" or "Platonic Year") — is the longest astro
ZH_5_06 — Horizon Astronomy: Skyline Observations, Foresights, and Horizonal Calendars
Horizon astronomy — the practice of observing where celestial bodies rise and set along the natural skyline — is the most ancient, most widespread, and most practical form of astronomical observation. Unlike meridian tra
ZH_5_25 — Polynesian Star Navigation and Pacific Migration
Polynesian wayfinding — the ability to navigate thousands of kilometers of open ocean without instruments — represents one of humanity's supreme intellectual achievements. Between c. 3,000 BCE and 1250 CE, Austronesian-s
ZH_5_07 — Light and Shadow Hierophanies: Temple Sun Daggers and Solar Inserts
A hierophany — a manifestation of the sacred — is realized in some of the world's most famous ancient structures through the precise interplay of light and shadow. On specific calendar dates — typically solstices, equino
ZH_5_23 — Ancestral Puebloan Archaeoastronomy: Celestial Alignments in the American Southwest
The Ancestral Puebloan civilization (c. 100–1300 CE) of the American Southwest developed one of the most sophisticated archaeoastronomical traditions outside the Old World. Chaco Canyon (New Mexico), the cultural center
ZH_5_18 — Enuma Anu Enlil: Babylonian Celestial Omen Series and Astral Science
The Enuma Anu Enlil ("When Anu and Enlil...") is the most extensive celestial omen series from ancient Mesopotamia — comprising approximately 70 tablets containing some 7,000 omen entries. The series was compiled during
ZH_5_16 — Eclipse Prediction and the Saros Cycle
The Saros cycle — a period of approximately 6,585.3 days (18 years, 11 days, 8 hours) after which the Sun, Moon, and lunar nodes return to nearly identical relative positions — has been the primary tool for eclipse predi
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