མཛེས་སྡུག་དང་བདེ་ཐང

རིག་གནས་དང་ལོ་རྒྱུས

ཟས་དང་བཏུང་རྫས

ཕྱིར་འཕྲུལ་རིག

ཁོར་ཡུག

བིལུ་པིརིན་ཊི ༢༨༢ ཡོད • ཡན་ལག་དབྱེ་རིམ ༡༦

ཡན་ལག་དབྱེ་རིམ་ལྟ་བཤེར

བིལུ་པིརིན་ཊི (༢༨༢)

Renaissance (1400–1600)

Renaissance (1400–1600)

Renaissance (1400–1600)

Renaissance (1400–1600)

TheChef གྱིས

Food & Agriculture

TheChef གྱིས

Food & Agriculture

Spartan གྱིས

ཁོར་ཡུག

ཡན་ལག་དབྱེ་རིམ་ལྟ་བཤེར

རླུང

ས

རྒྱ་མཚོ

བར་སྣང

ས་འོག

རྒྱ་མཚོ་འོག

ས་ཁྱོན་ཆ་མཉམ

བྱང་མཐའ

ཆུ་ནང་གནས

ནགས་ཚལ

ས་སྟོང

གྲོང་ཁྱེར

བྱང་ཐང

རི

ཁྱིམ

འཚོ་སྲོག

བིལུ་པིརིན་ཊི (༢༨༢)

Building an Arab Kamal — The Indian Ocean Navigator's Latitude Finder

Building a Merkhet — The Egyptian Star Transit Instrument for Finding True North

Building a Camera Obscura — Projecting the Sun and Eclipses Safely

Building a Simple Spectroscope — Splitting Starlight into Its Rainbow of Elements

Building a Newtonian Reflecting Telescope — Mirrors Instead of Lenses

Building a Celestial Globe — Mapping the Stars on a Sphere

Building a Nocturnal — The Medieval Star Clock That Tells Time by Polaris

Using a Viking Sunstone — Navigating by Polarized Skylight with Iceland Spar

Preparing a Viking Sunstone — Selecting and Cleaving Optical Calcite for Navigation

Building a Mural Quadrant — The Wall-Mounted Instrument for Precise Star Positions

Building a Galilean Telescope — The Instrument That Changed Our View of the Universe

Building a Copernican Orrery — A Mechanical Model of the Heliocentric Solar System

Building a Cross-Staff — The Medieval Navigator's Angle-Measuring Instrument

Building a Brass Astrolabe — The Islamic Golden Age Instrument That Mapped the Sky

Building a Chinese Armillary Sphere — The Bronze Instrument That Mapped the Heavens

Salt-Curing Meat for Preservation — Dry Salting Without Refrigeration

Striking Fire with Flint and Steel — The Iron Age Upgrade to Fire Starting

Boiling Water in a Leaf over Direct Flame — Why Water Keeps the Vessel from Burning

Forging an Iron Fish Hook — Drawing, Bending, and Barbing Wire Stock

Striking Fire from Flint and Iron Pyrite — Spark-Based Fire Starting