sighting distance
31Halley's Comet — For the video game, see Halley s Comet (video game). 1P/Halley (Halley s Comet) Halley s Comet on March 8, 1986 Discovery …
32Boeing B-29 Superfortress — This article is about the WWII heavy bomber. For other meanings, see B29 (disambiguation). B 29 Superfortress A USAAF B 29 Superfortress …
33Lonnie Zamora — (born 1933 [ [http://www.ufodigest.com/socorro.html Could 1964 UFO be lunar lander?] ] ) is a retired New Mexico police officer who reported a UFO close encounter of the first, second and third kinds on Friday, April 24, 1964, near Socorro, New… …
34Heliograph — A Heliograph (from the Greek helios (Lang el| Ἥλιος), meaning sun , and (γραφειν) = write) is a wireless solar telegraph that signals using Morse code flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the …
35Backstaff — Not to be confused with Ballastella. Davis quadrant from the beginning of the 18th century The backstaff or back quadrant is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When… …
36Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
37Compass — This article is about the direction finding instrument used in navigation. For other uses, see Compass (disambiguation). A simple dry magnetic pocket compass …
38New Horizons — For other uses, see New Horizons (disambiguation). New Horizons Operator NASA Major contractors Applied Physics Laboratory (APL) Southwest Research Institute (SwRI) …
39Exeter incident — The Exeter incident was a highly publicized UFO sighting that occurred in September 1965, approximately 5 miles from Exeter, New Hampshire, in the neighboring community of Kensington. Although several separate sightings had been made by numerous… …
40Brevity code — Contents 1 American/NATO codes 1.1 A 1.2 B 1.3 C …
