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  2. Visibility - Wikipedia

    en.wikipedia.org/wiki/Visibility

    The height of the elevated point plus the Earth radius form its hypotenuse. If both the eyes and the object are raised above the reference plane, there are two right-angled triangles. If both the eyes and the object are raised above the reference plane, there are two right-angled triangles.

  3. Radar horizon - Wikipedia

    en.wikipedia.org/wiki/Radar_horizon

    This reduces the shadow zone, but causes errors in distance and height measuring. In practice, to find , one must be using a value of 8.5·10 3 km for the effective Earth's radius (4/3 of it), instead of the real one. [2] So the equation becomes:

  4. Horizon - Wikipedia

    en.wikipedia.org/wiki/Horizon

    For example, for an observer B with a height of h B =1.70 m standing on the ground, the horizon is D B =4.65 km away. For a tower with a height of h L =100 m, the horizon distance is D L =35.7 km. Thus an observer on a beach can see the top of the tower as long as it is not more than D BL =40.35 km away.

  5. Sunrise equation - Wikipedia

    en.wikipedia.org/wiki/Sunrise_equation

    The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any ... latitude = 33.00801 longitude = 35.08794 elevation = 0 print ...

  6. Long distance observations - Wikipedia

    en.wikipedia.org/wiki/Long_distance_observations

    A typical example of long-distance observation. The Tatra Mountains as seen from the Łysa Góra, in southeast Poland, at a distance of about 200 km (120 mi).. Long-distance observation is any visual observation, for sightseeing or photography, that targets all the objects, visible from the extremal distance with the possibility to see them closely.

  7. Intercept method - Wikipedia

    en.wikipedia.org/wiki/Intercept_method

    In astronomical navigation, the intercept method, also known as Marcq St. Hilaire method, is a method of calculating an observer's position on Earth (geopositioning).It was originally called the azimuth intercept method because the process involves drawing a line which intercepts the azimuth line.

  8. Angular distance - Wikipedia

    en.wikipedia.org/wiki/Angular_distance

    When the rays are lines of sight from an observer to two points in space, it is known as the apparent distance or apparent separation. Angular distance appears in mathematics (in particular geometry and trigonometry ) and all natural sciences (e.g., kinematics , astronomy , and geophysics ).

  9. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    Under visual meteorological conditions, the minimum visual range, distance from clouds, or cloud clearance requirements to be maintained above ground vary by jurisdiction, and may also vary according to the airspace in which the aircraft is operating. [4] In some countries, VFR flight is permitted at night, and is known as night VFR.

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