Places & Geography
# Geodesy & Navigation

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Latitude & Longitude

locate a point on Earth using latitude-longitude coordinates

55 deg 45' N, 37 deg 37' E
find the coordinates of a city

Algiers coordinates
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Distances

compute the great-circle distance between points on the globe

23.5S 46.4W to 56.8N 60.6E
compute the distance between cities

San Francisco to Tokyo
compute distances between multiple cities

Buenos Aires to Sao Paulo to La Paz to Panama
compute the distance to the horizon

how far can I see at 30,000 ft
calculate line of sight to the horizon from Mount Everest
compute horizon distance for radio waves

how far can radio waves propagate
calculate radio horizon at 100 m altitude
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Bearings

get information about a compass heading

SSW
15 North
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Geodetic Data

get information about a geodetic reference ellipsoid

GRS80
compare multiple ellipsoids

Airy 1830, Modified Fischer 1960
get information about a geodetic datum

GDA94
compare multiple geodetic data

NAD27, ITRF00
compute current local gravitational field strength

geogravity
compute gravitational field strength at specified coordinates

geogravity 21.28N 157.60W
compute current local geomagnetic field strength

geomagnetism
compute geomagnetic field strength for a given date and location

geomagnetism Oslo on 12 Feb 2007