sighting distance
121Major explorations after the Age of Discovery — Major explorations continued after the Age of Discovery. By the early seventeenth century, vessels were sufficiently well built and their navigators competent enough to travel to virtually anywhere on the planet by sea. In the 17th century Dutch… …
122Voyages of Christopher Columbus — Discovery of the Americas and Discovery of America redirect here. For other uses, see Discovery of the Americas (disambiguation). Voyages of Christopher Columbus The Four Voyages of Columbus Participants Christopher Columbus and crew …
123Mesoamerican Long Count calendar — Long Count redirects here. For the 1927 boxing match, see The Long Count Fight. Detail showing three columns of glyphs from a portion of the 2nd century CE La Mojarra Stela 1. The left column gives a Long Count date of 8.5.16.9.7, or 156 CE. The… …
124Ivory-billed Woodpecker — Taxobox name = Ivory billed Woodpecker status = CR status system = IUCN3.1 trend = down status ref = [IUCN2006|assessors=BirdLife International|year=2005|id=3712|title=Campephilus principalis|downloaded=9 May 2006 Database entry includes… …
125Armillary sphere — An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of the celestial sphere. Description and use of the armillary sphere The exterior parts of this machine are a compages of brass rings, which represent …
126Triangulation — In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly. The point can… …
127Enceladus (moon) — Infobox Planet name = Enceladus alt names = Saturn II adjectives = Enceladean caption = Degraded craters, fractures and disrupted terrain in Cassini mosaic of the north polar region of Enceladus bgcolour = #a0ffa0 discovery = yes discoverer =… …
128Schräge Musik — Part of World War II Captured Messerschmitt Bf 110G 4 showing twin cannon Schräge Musik installation of two cannon with their muzzles j …
