Locator

This JavaScript app calculates distances and directions from one location on the surface of Earth towards another, both the “as the bird flies” surface distance, and the “as the neutrino flies” straight-line distance. This straight-line direction to another location on Earth may be pointed out with the angles of azimuth and inclination:

Azimuth – compass heading when leaving your location traveling towards another along a great circle path (shortest surface route), where North=0°, East=90°, South=180° and West=270°.

Inclination – angle below horizontal of the straight line path to a distant location, where 0° is horizontal & local, and 90° points straight down through the center of the Earth to the antipode.

select two cities:   city 1 Abidjan, Ivory Coast Abu Dhabi, United Arab Emirates Abuja, Nigeria Accra, Ghana Addis Ababa, Ethiopia Adelaide, Australia Agana, Guam Island Albuquerque, New Mexico Algiers, Algeria Alice Springs, Australia Alofi, Niue Amarillo, Texas Amman, Jordan Amsterdam, Netherlands Anchorage, Alaska Andorra la Vella, Andorra Anguilla, Anguilla Island Ankara, Turkey Antananarivo, Madagascar Apia, Samoa Armidale, Australia Ashgabat, Turkmenistan Asmara, Eritrea Astana, Kazakhstan Asunción, Paraguay Athens, Greece Atlanta, Georgia Auckland, New Zealand Avarua, Cook Islands Baghdad, Iraq Baku, Azerbaijan Baltimore, Maryland Bamako, Mali Bandar Seri Begawan, Brunei Bangkok, Thailand Bangor, Maine Bangui, Central African Republic Banjul, The Gambia Barcelona, Spain Basseterre, Saint Kitts and Nevis Beijing, China Beirut, Lebanon Belem, Brazil Belgrade, Yugoslavia (Serbia/Montenegro) Belmopan, Belize Berkeley, California Berlin, Germany Bern, Switzerland Bishkek, Kyrgyzstan Bissau, Guinea-Bissau Bogot·, Colombia Boise, Idaho Bombay, India Boston, Massachusetts Brasilia, Brazil Bratislava, Slovakia Brazzaville, Congo (Brazzaville) Bridgetown, Barbados Brisbane, Australia Brussels, Belgium Bucharest, Romania Budapest, Hungary Buenos Aires, Argentina Buffalo, N.Y. Bujumbura, Burundi Butte, Montana Cairo, Egypt Calcutta, India Calgary, Alberta Canberra, Australia Canton, China Capetown, South Africa Caracas, Venezuela Carlsbad, New Mexico Castries, Saint Lucia Charlotte Amalie, US Virgin Islands Cheyenne, Wyoming Chicago, Illinois Chihuahua, Mexico Chisinau, Moldova Cincinnati, Ohio Cleveland, Ohio Cockburn Town, Turks & Caicos Islands Colombo, Sri Lanka Conakry, Guinea Copenhagen, Denmark Dakar, Senegal Dallas, Texas Damascus, Syria Dar es Salaam, Tanzania Darwin, Australia Denver, Colorado Detroit, Michigan Dhaka, Bangladesh Dili, East Timor Djibouti, Djibouti Doha (Al-Dawhah), Qatar Douglas, Isle of Man Dublin (City), Ireland Dushanbe, Tajikistan Edmonton, Alberta Fairbanks, Alaska Flagstaff, Arizona Flying Fish Cove, Christmas Island Fort-de-France, Martinique Island Frankfurt, Germany Freetown, Sierra Leone Fresno, California Funafuti, Tuvalu Funchal, Madeira Islands Gaborone, Botswana George Town, Cayman Islands Georgetown, Guyana Gibraltar, Gibraltar Glasgow, Scotland Gothenburg, Sweden Grand Junction, Colorado Guatemala (City), Guatemala Hamburg, Germany Hamilton, Bermuda Hammerfest, Norway Hanoi, Vietnam Harare, Zimbabwe Havana, Cuba Helsinki, Finland Hong Kong, Hong Kong Honiara, Solomon Islands Honolulu, Hawaii Houston, Texas Islamabad, Pakistan Istanbul, Turkey Jakarta, Indonesia Jerusalem, Israel Johannesburg, South Africa Kabul, Afghanistan Kampala, Uganda Kansas City, Missouri Karachi, Pakistan Kathmandu, Nepal Khartoum, Sudan Kiev, Ukraine Kigali, Rwanda Kingston, Jamaica Kingstown, St. Vincent & the Grenadines Kinshasa, Congo (Kinshasa) Koror, Palau Kuala Lumpur, Malaysia Kunming, China Kuwait (City), Kuwait La Paz, Bolivia Lagos, Nigeria Las Palmas de Gran Canaria, Canary Island Las Vegas, Nevada Lhasa, Tibet Libreville, Gabon Lilongwe, Malawi Lima, Peru Lincoln, Nebraska Lisbon, Portugal Liverpool, England Ljubljana, Slovenia Lomé, Togo London, United Kingdom Los Angeles, California Luanda, Angola Lund, Sweden Lusaka, Zambia Luxembourg, Luxembourg Macau City, Macau (Macao) Madrid, Spain Majuro, Marshall Islands Malabo, Equatorial Guinea Male, Maldives Malmo, Sweden Managua, Nicaragua Manama, Bahrain Manila, Philippines Maputo, Mozambique Mariana, Northern Mariana Islands Maseru, Lesotho Mbabane, Swaziland Mecca, Saudi Arabia Melbourne, Australia Mexico City, Mexico Miami, Florida Milan, Italy Minneapolis, Minnesota Minsk, Belarus Mogadishu, Somalia Monaco, Monaco Monrovia, Liberia Montevideo, Uruguay Montreal, Quebec Moroni, Comoros Moscow, Russia Munich, Germany Muscat, Oman N'Djamena, Chad Nairobi, Kenya Naples, Italy Nashville, Tennessee Nassau, The Bahamas New Delhi, India New Orleans, Louisiana New York, N.Y. Niamey, Niger Nicosia (Lefkosia), Cyprus Nouakchott, Mauritania Noumea, New Caledonia Island Nuku'alofa, Tonga Odessa, Ukraine Oklahoma City, Oklahoma Omaha, Nebraska Oranjestad, Aruba Island Osaka, Japan Oslo, Norway Ottawa, Canada Ouagadougou, Burkina Faso P'yongyang, Korea (North) Palikir, Micronesia Panama (City), Panama Papeete, French Polynesia Paramaribo, Suriname Paris, France Perth, Australia Philadelphia, Pennsylvania Phnom Penh, Cambodia Phoenix, Arizona Port Louis, Mauritius Port Moresby, Papua New Guinea Port-Vila, Vanuatu Port-au-Prince, Haiti Port-of-Spain, Trinidad and Tobago Portland, Oregon Porto-Novo, Benin Prague, Czech Republic Praia, Cape Verde Pretoria, South Africa Pueblo, Colorado Quebec City, Quebec Quito, Ecuador Rabat, Morocco Reno, Nevada Reykjavik, Iceland Riga, Latvia Rio de Janeiro, Brazil Riyadh, Saudi Arabia Road Town, British Virgin Islands Rome, Italy Roseau, Dominica Sacramento, California Saint George's, Grenada Saint John's, Antigua and Barbuda Salt Lake City, Utah San Antonio, Texas San Diego, California San Francisco, California San José, Costa Rica San Juan, Puerto Rico San Marino, San Marino San Salvador, El Salvador Sanaa, Yemen Santa Fe, New Mexico Santiago, Chile Santo Domingo, Dominican Republic São Paulo, Brazil Sarajevo, Bosnia and Herzegowina Seattle, Washington Seoul, Korea (South) Shanghai, China Singapore, Singapore Skopje, Macedonia Sofia, Bulgaria Springfield, Illinois St. George's, Grenada/Grenadine Islands St. Helier, Jersey Island (Channel Is.) St. Louis, Missouri St. Peter Port, Guernsey Island (Channel Is.) St. Petersburg, Russia Stockholm, Sweden Suva, Fiji Sydney, Australia Syracuse, New York São Tomé, São Tomé and Principe T'bilisi, Georgia Taipei, Taiwan Tallinn, Estonia Tarawa, Kiribati Tashkent, Uzbekistan Tegucigalpa, Honduras Tehran, Iran Thimphu, Bhutan Tirana, Albania Tokyo, Japan Torshavn, Faroe Islands Trinidad, Colorado Tripoli, Libya Tucson, Arizona Tunis, Tunisia Ulaanbaatar, Mongolia Urbana, Illinois Vaduz, Liechtenstein Valletta, Malta Vancouver, Canada Venice, Italy Veracruz, Mexico Victoria, Seychelles Vienna, Austria Vientiane, Laos Vilnius, Lithuania Vladivostok, Russia Warsaw, Poland Washington D.C., United States Wellington, New Zealand Willemstad, Netherlands Antilles Windhoek, Namibia Winnipeg, Manitoba Yakutzk, Russia Yamoussoukro, Cote d'Ivoire Yangon (Rangoon), Burma (Myanmar) Yaoundé, Cameroon Yaren District, Nauru Yerevan, Armenia Zagreb, Croatia (Hrvatska) Zanzibar, Tanzania Zurich, Switzerland latitude: longitude:   city 2 Abidjan, Ivory Coast Abu Dhabi, United Arab Emirates Abuja, Nigeria Accra, Ghana Addis Ababa, Ethiopia Adelaide, Australia Agana, Guam Island Albuquerque, New Mexico Algiers, Algeria Alice Springs, Australia Alofi, Niue Amarillo, Texas Amman, Jordan Amsterdam, Netherlands Anchorage, Alaska Andorra la Vella, Andorra Anguilla, Anguilla Island Ankara, Turkey Antananarivo, Madagascar Apia, Samoa Armidale, Australia Ashgabat, Turkmenistan Asmara, Eritrea Astana, Kazakhstan Asunción, Paraguay Athens, Greece Atlanta, Georgia Auckland, New Zealand Avarua, Cook Islands Baghdad, Iraq Baku, Azerbaijan Baltimore, Maryland Bamako, Mali Bandar Seri Begawan, Brunei Bangkok, Thailand Bangor, Maine Bangui, Central African Republic Banjul, The Gambia Barcelona, Spain Basseterre, Saint Kitts and Nevis Beijing, China Beirut, Lebanon Belem, Brazil Belgrade, Yugoslavia (Serbia/Montenegro) Belmopan, Belize Berkeley, California Berlin, Germany Bern, Switzerland Bishkek, Kyrgyzstan Bissau, Guinea-Bissau Bogot·, Colombia Boise, Idaho Bombay, India Boston, Massachusetts Brasilia, Brazil Bratislava, Slovakia Brazzaville, Congo (Brazzaville) Bridgetown, Barbados Brisbane, Australia Brussels, Belgium Bucharest, Romania Budapest, Hungary Buenos Aires, Argentina Buffalo, N.Y. Bujumbura, Burundi Butte, Montana Cairo, Egypt Calcutta, India Calgary, Alberta Canberra, Australia Canton, China Capetown, South Africa Caracas, Venezuela Carlsbad, New Mexico Castries, Saint Lucia Charlotte Amalie, US Virgin Islands Cheyenne, Wyoming Chicago, Illinois Chihuahua, Mexico Chisinau, Moldova Cincinnati, Ohio Cleveland, Ohio Cockburn Town, Turks & Caicos Islands Colombo, Sri Lanka Conakry, Guinea Copenhagen, Denmark Dakar, Senegal Dallas, Texas Damascus, Syria Dar es Salaam, Tanzania Darwin, Australia Denver, Colorado Detroit, Michigan Dhaka, Bangladesh Dili, East Timor Djibouti, Djibouti Doha (Al-Dawhah), Qatar Douglas, Isle of Man Dublin (City), Ireland Dushanbe, Tajikistan Edmonton, Alberta Fairbanks, Alaska Flagstaff, Arizona Flying Fish Cove, Christmas Island Fort-de-France, Martinique Island Frankfurt, Germany Freetown, Sierra Leone Fresno, California Funafuti, Tuvalu Funchal, Madeira Islands Gaborone, Botswana George Town, Cayman Islands Georgetown, Guyana Gibraltar, Gibraltar Glasgow, Scotland Gothenburg, Sweden Grand Junction, Colorado Guatemala (City), Guatemala Hamburg, Germany Hamilton, Bermuda Hammerfest, Norway Hanoi, Vietnam Harare, Zimbabwe Havana, Cuba Helsinki, Finland Hong Kong, Hong Kong Honiara, Solomon Islands Honolulu, Hawaii Houston, Texas Islamabad, Pakistan Istanbul, Turkey Jakarta, Indonesia Jerusalem, Israel Johannesburg, South Africa Kabul, Afghanistan Kampala, Uganda Kansas City, Missouri Karachi, Pakistan Kathmandu, Nepal Khartoum, Sudan Kiev, Ukraine Kigali, Rwanda Kingston, Jamaica Kingstown, St. Vincent & the Grenadines Kinshasa, Congo (Kinshasa) Koror, Palau Kuala Lumpur, Malaysia Kunming, China Kuwait (City), Kuwait La Paz, Bolivia Lagos, Nigeria Las Palmas de Gran Canaria, Canary Island Las Vegas, Nevada Lhasa, Tibet Libreville, Gabon Lilongwe, Malawi Lima, Peru Lincoln, Nebraska Lisbon, Portugal Liverpool, England Ljubljana, Slovenia Lomé, Togo London, United Kingdom Los Angeles, California Luanda, Angola Lund, Sweden Lusaka, Zambia Luxembourg, Luxembourg Macau City, Macau (Macao) Madrid, Spain Majuro, Marshall Islands Malabo, Equatorial Guinea Male, Maldives Malmo, Sweden Managua, Nicaragua Manama, Bahrain Manila, Philippines Maputo, Mozambique Mariana, Northern Mariana Islands Maseru, Lesotho Mbabane, Swaziland Mecca, Saudi Arabia Melbourne, Australia Mexico City, Mexico Miami, Florida Milan, Italy Minneapolis, Minnesota Minsk, Belarus Mogadishu, Somalia Monaco, Monaco Monrovia, Liberia Montevideo, Uruguay Montreal, Quebec Moroni, Comoros Moscow, Russia Munich, Germany Muscat, Oman N'Djamena, Chad Nairobi, Kenya Naples, Italy Nashville, Tennessee Nassau, The Bahamas New Delhi, India New Orleans, Louisiana New York, N.Y. Niamey, Niger Nicosia (Lefkosia), Cyprus Nouakchott, Mauritania Noumea, New Caledonia Island Nuku'alofa, Tonga Odessa, Ukraine Oklahoma City, Oklahoma Omaha, Nebraska Oranjestad, Aruba Island Osaka, Japan Oslo, Norway Ottawa, Canada Ouagadougou, Burkina Faso P'yongyang, Korea (North) Palikir, Micronesia Panama (City), Panama Papeete, French Polynesia Paramaribo, Suriname Paris, France Perth, Australia Philadelphia, Pennsylvania Phnom Penh, Cambodia Phoenix, Arizona Port Louis, Mauritius Port Moresby, Papua New Guinea Port-Vila, Vanuatu Port-au-Prince, Haiti Port-of-Spain, Trinidad and Tobago Portland, Oregon Porto-Novo, Benin Prague, Czech Republic Praia, Cape Verde Pretoria, South Africa Pueblo, Colorado Quebec City, Quebec Quito, Ecuador Rabat, Morocco Reno, Nevada Reykjavik, Iceland Riga, Latvia Rio de Janeiro, Brazil Riyadh, Saudi Arabia Road Town, British Virgin Islands Rome, Italy Roseau, Dominica Sacramento, California Saint George's, Grenada Saint John's, Antigua and Barbuda Salt Lake City, Utah San Antonio, Texas San Diego, California San Francisco, California San José, Costa Rica San Juan, Puerto Rico San Marino, San Marino San Salvador, El Salvador Sanaa, Yemen Santa Fe, New Mexico Santiago, Chile Santo Domingo, Dominican Republic São Paulo, Brazil Sarajevo, Bosnia and Herzegowina Seattle, Washington Seoul, Korea (South) Shanghai, China Singapore, Singapore Skopje, Macedonia Sofia, Bulgaria Springfield, Illinois St. George's, Grenada/Grenadine Islands St. Helier, Jersey Island (Channel Is.) St. Louis, Missouri St. Peter Port, Guernsey Island (Channel Is.) St. Petersburg, Russia Stockholm, Sweden Suva, Fiji Sydney, Australia Syracuse, New York São Tomé, Sao Tome and Principe T'bilisi, Georgia Taipei, Taiwan Tallinn, Estonia Tarawa, Kiribati Tashkent, Uzbekistan Tegucigalpa, Honduras Tehran, Iran Thimphu, Bhutan Tirana, Albania Tokyo, Japan Torshavn, Faroe Islands Trinidad, Colorado Tripoli, Libya Tucson, Arizona Tunis, Tunisia Ulaanbaatar, Mongolia Urbana, Illinois Vaduz, Liechtenstein Valletta, Malta Vancouver, Canada Venice, Italy Veracruz, Mexico Victoria, Seychelles Vienna, Austria Vientiane, Laos Vilnius, Lithuania Vladivostok, Russia Warsaw, Poland Washington D.C., United States Wellington, New Zealand Willemstad, Netherlands Antilles Windhoek, Namibia Winnipeg, Manitoba Yakutzk, Russia Yamoussoukro, Cote d'Ivoire Yangon (Rangoon), Burma (Myanmar) Yaoundé, Cameroon Yaren District, Nauru Yerevan, Armenia Zagreb, Croatia (Hrvatska) Zanzibar, Tanzania Zurich, Switzerland latitude: longitude:  directions and distances between cities:   inclination: deg azimuth: deg back azimuth: deg   surface distance: km miles nautical miles   straight-line distance: km miles nautical miles

or enter lat / lon coordinates:   location 1 latitude: d m s NS longitude: d m s EW   location 2 latitude: d m s NS longitude: d m s EW      directions & distances between locations:   inclination: deg azimuth: deg back azimuth: deg   surface distance: km miles nautical miles   straight-line distance: km miles nautical miles

Calculations assume Earth to be spherical with a 6366.707 km radius. If you come across any errors or have ideas about how to improve the code, please pass along your observations.