altitude theorem
51Vacuum — This article is about empty physical space or the absence of matter. For other uses, see Vacuum (disambiguation). Free space redirects here. For other uses, see Free space (disambiguation). Pump to demonstrate vacuum In everyday usage, vacuum is… …
52Non-line-of-sight propagation — Non line of sight (NLOS) or near line of sight is a term used to describe radio transmission across a path that is partially obstructed, usually by a physical object in the innermost Fresnel zone. Many types of radio transmissions depend, to… …
53Orbital mechanics — A satellite orbiting the earth has a tangential velocity and an inward acceleration. Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other… …
54Synthetic aperture radar — (SAR) is a form of radar in which the highly directional (and thus very large) rotating antenna used by conventional radar is replaced with many low directivity small stationary antenna positions scattered over some area near or around the target …
55Saganami Island Tactical Simulator — Infobox Game title = Saganami Island Tactical Simulator subtitle = image link = image caption = Saganami Island Tactical Simulator Cover Art designer = Ken Burnside, Thomas Pope, David Weber illustrator = publisher = Ad Astra Games players = 2 or …
56Area — This article is about the geometric quantity. For other uses, see Area (disambiguation). The combined area of these three shapes is between 15 and 16 squares. Area is a quantity that expresses the extent of a two dimensional surface or shape in… …
57Infrared — For other uses, see Infrared (disambiguation). An image of two people in mid infrared ( thermal ) light (false color) …
58Incircle and excircles of a triangle — A triangle (black) with incircle (blue), incentre (I), excircles (orange), excentres (JA,JB,JC), internal angle bisectors (red) and external angle bisectors (green) In geometry, the incircle or inscribed circle of a triangle is the largest circle …
59The Nine Chapters on the Mathematical Art — Not to be confused with Mathematical Treatise in Nine Sections. A page of The Nine Chapters on the Mathematical Art The Nine Chapters on the Mathematical Art (simplified Chinese: 九章算术; traditional Chinese: 九章算術 …
60John Wallis — Infobox Scientist name = John Wallis box width = 300px |300px image width = 300px caption = birth date = birth date|1616|11|23 birth place = Ashford, Kent, England death date = death date and age|1703|10|28|1616|11|23 death place = Oxford,… …
