The time zone input for SunAngle should be set to indicate how many hours your local time zone differs from Greenwich Mean Time (GMT), which is the time zone through the zero degree line of longitude in Greenwich (a district of London, UK). There is typically one hour of time zone variance per 15 degrees of longitude, with locations West of Greenwich being behind GMT, and locations East of Greenwich being ahead of GMT.

Time zones are a little tricky, so please pay careful attention to this input. Note that most locations West of Greenwich (such as North America) should have a West longitude value and a time zone of GMT minus some number of hours. Locations East of Greenwich (such as Asia) should have an East longitude and and a time zone of GMT plus some number of hours.

Please note that the time zone input assumes that you're not including daylight savings time when you indicate your time difference from GMT. For example: the author lives in Seattle, Washington, USA, where the time difference from GMT is -8 hours. When daylight savings time is in effect, however, the time difference is actually -7 hours. But for the purposes of the SunAngle inputs it would be correct to indicate the time zone as GMT-8 and set the daylight savings input to "Yes" during the summer.

Here is a map of the world with time zones for each country.

Here is a list of countries with their standard time offset from GMT:

Afghanistan: +4.5 hours
Albania: +1 hour
Algeria: +1 hour
American Samoa: -11 hours
Andorra: +1 hour
Angola: +1 hour
Anguilla: -4 hours
Antarctica: -2 hours
Antigua: -4 hours
Argentina: -3 hours
Argentina western prov: -4 hours
Armenia: +4 hours
Aruba: -4 hours
Ascension: 0 hours
Australia Northern Territory: +9.5 hours
Australia Lord Howe Island: +10.5 hours
Australia New South Wales: +10 hours
Australia Queensland: +10 hours
Australia Victoria: +10 hours
Australia Australian Captial Territory: +10 hours
Australia South: +9.5 hours
Australia Tasmania: +10 hours
Australia Western: +8 hours
Austria: +1 hour
Azerbajian: +3 hours
Azores: -1 hour

Bahamas: -5 hours
Bahrain: +3 hours
Balearic Islands: +1 hour
Bangladesh: +6 hours
Barbados: -4 hours
Belarus: +2 hours
Belgium: +1 hour
Belize: -6 hours
Benin: +1 hour
Bermuda: -4 hours
Bhutan: +6 hours
Bolivia: -4 hours
Bonaire: -4 hours
Bosnia Hercegovina: +1 hour
Botswana: +2 hours
Brazil Acre: -4 hours
Brazil Atlantic Islands: -1 hour
Brazil East: -3 hours
Brazil West: -4 hours
British Virgin Islands: -4 hours
Brunei: +8 hours
Bulgaria: +2 hours
Burkina Faso: 0 hours
Burundi: +2 hours

Cambodia: +7 hours
Cameroon: +1 hour
Canada Central: -6 hours
Canada Eastern: -5 hours
Canada Mountain: -7 hours
Canada Yukon & Pacific: -8 hours
Canada Atlantic: -4 hours
Canada Newfoundland: -3.5 hours
Canary Islands: 0 hours
Canton Enderbury Islands: -11 hours
Cape Verde: -1 hour
Caroline Island: +11 hours
Cayman Islands: -5 hours
Central African Rep: +1 hour
Chad: +1 hour
Channel Islands: 0 hours
Chatham Island: +12.75 hours
Chile: -4 hours
China People's Rep: +8 hours
Christmas Islands: -10 hours
Cocos (Keeling) Islands: +6.5 hours
Colombia: -5 hours
Congo: +1 hour
Cook Islands: -10 hours
Costa Rica: -6 hours
Cote d'Ivoire: 0 hours
Croatia: +1 hour
Cuba: -5 hours
Curacao: -4 hours
Cyprus: +2 hours
Czech Republic: +1 hour

Dahomey: +1 hour
Denmark: +1 hour
Djibouti: +3 hours
Dominica: -4 hours
Dominican Republic: -4 hours

Easter Island: -6 hours
Ecuador: -5 hours
Egypt: +2 hours
El Salvador: -6 hours
England: 0 hours
Equitorial Guinea: +1 hour
Eritrea: +3 hours
Estonia: +2 hours
Ethiopia: +3 hours

Falkland Islands: -4 hours
Faroe Island: 0 hours
Fiji: +12 hours
Finland: +2 hours
France: +1 hour
French Guiana: -3 hours
French Polynesia: -10 hours

Gabon: +1 hour
Galapagos Islands: -5 hours
Gambia: 0 hours
Gambier Island: -9 hours
Georgia: +4 hours
Germany: +1 hour
Ghana: 0 hours
Gibraltar: +1 hour
Greece: +2 hours
Greenland: -3 hours
Greenland Thule: -4 hours
Greenland Scoresbysun: -1 hour
Grenada: -4 hours
Grenadines: -4 hours
Guadeloupe: -4 hours
Guam: +10 hours
Guatemala: -6 hours
Guinea: 0 hours
Guinea Bissau: 0 hours
Guyana: -3 hours

Haiti: -5 hours
Honduras: -6 hours
Hong kong: +8 hours
Hungary: +1 hour

Iceland: 0 hours
India: +5.5 hours
Indonesia Central: +8 hours
Indonesia East: +9 hours
Indonesia West: +7 hours
Iran: +3.5 hours
Iraq: +3 hours
Ireland Republic of: 0 hours
Israel: +2 hours
Italy: +1 hour

Jamaica: -5 hours
Japan: +9 hours
Johnston Island: -10 hours
Jordan: +2 hours

Kazakhstan: +6 hours
Kenya: +3 hours
Kiribati: +12 hours
Korea Dem Republic of: +9 hours
Korea Republic of: +9 hours
Kusaie: +12 hours
Kuwait: +3 hours
Kwajalein: -12 hours
Kyrgyzstan: +5 hours

Laos: +7 hours
Latvia: +2 hours
Lebanon: +2 hours
Leeward Islands: -4 hours
Lesotho: +2 hours
Liberia: 0 hours
Libya: +2 hours
Lithuania: +2 hours
Luxembourg: +1 hour

Macedonia: +1 hour
Madagascar: +3 hours
Madeira: 0 hours
Malawi: +2 hours
Malaysia: +8 hours
Maldives: +5 hours
Mali: 0 hours
Mallorca Islands: +1 hour
Malta: +1 hour
Mariana Island: +10 hours
Marquesas Islands: -9.5 hours
Marshall Islands: +12 hours
Martinique: -4 hours
Mauritania: 0 hours
Mauritius: +4 hours
Mayotte: +3 hours
Melilla: +1 hour
Mexico: -6 hours
Mexico Baja Calif Norte: -8 hours
Mexico Nayarit: -7 hours
Mexico Sinaloa: -7 hours
Mexico Sonora: -7 hours
Midway Island: -11 hours
Moldova: +2 hours
Moldovian Rep Pridnestrovye: +2 hours
Monaco: +1 hour
Mongolia: +8 hours
Morocco: 0 hours
Mozambique: +2 hours
Myanmar: +6.5 hours

Oman: +4 hours

Pakistan: +5 hours
Palau: +9 hours
Panama: -5 hours
Papua New Guinea: +10 hours
Paraguay: -4 hours
Peru: -5 hours
Philippines: +8 hours
Pingelap: +12 hours
Poland: +1 hour
Ponape Island: +11 hours
Portugal: +1 hour
Principe Island: 0 hours
Puerto Rico: -4 hours

Qatar: +3 hours

Reunion: +4 hours
Romania: +2 hours
Russian Federation zone eight: +9 hours
Russian Federation zone eleven: +12 hours
Russian Federation zone five: +6 hours
Russian Federation zone four: +5 hours
Russian Federation zone nine: +10 hours
Russian Federation zone one: +2 hours
Russian Federation zone seven: +8 hours
Russian Federation zone six: +7 hours
Russian Federation zone ten: +11 hours
Russian Federation zone three: +4 hours
Russian Federation zone two: +4 hours
Rwanda: +2 hours

Saba: -4 hours
Samoa: -11 hours
San Marino: +1 hour
Sao Tome e Principe: 0 hours
Saudi Arabia: +3 hours
Scotland: 0 hours
Senegal: 0 hours
Seychelles: +4 hours
Sierra Leone: 0 hours
Singapore: +8 hours
Slovakia: +1 hour
Slovenia: +1 hour
Society Island: -10 hours
Solomon Islands: +11 hours
Somalia: +3 hours
South Africa: +2 hours
Spain: +1 hour
Sri Lanka: +5.5 hours
St Christopher: -4 hours
St Croix: -4 hours
St Helena: 0 hours
St John: -4 hours
St Kitts Nevis: -4 hours
St Lucia: -4 hours
St Maarten: -4 hours
St Pierre & Miquelon: -3 hours
St Thomas: -4 hours
St Vincent: -4 hours
Sudan: +2 hours
Suriname: -3 hours
Swaziland: +2 hours
Sweden: +1 hour
Switzerland: +1 hour
Syria: +2 hours

Tahiti: -10 hours
Taiwan: +8 hours
Tajikistan: +6 hours
Tanzania: +3 hours
Thailand: +7 hours
Togo: 0 hours
Tonga: +13 hours
Trinidad and Tobago: -4 hours
Tuamotu Island: -10 hours
Tubuai Island: -10 hours
Tunisia: +1 hour
Turkey: +2 hours
Turkmenistan: +5 hours
Turks and Caicos Islands: -5 hours
Tuvalu: +12 hours

Uganda: +3 hours
Ukraine: +2 hours
United Arab Emirates: +4 hours
United Kingdom: 0 hours
USA Central: -6 hours
USA Eastern: -5 hours
USA Mountain: -7 hours
USA Arizona: -7 hours
USA Indiana East: -5 hours
USA Pacific: -8 hours
USA Alaska: -9 hours
USA Aleutian: -10 hours
USA Hawaii: -10 hours
Uruguay: -3 hours
Uzbekistan: +5 hours

Vanuatu: +11 hours
Vatican City: +1 hour
Venezuela: -4 hours
Vietnam: +7 hours
Virgin Islands: -4 hours

Wake Island: +12 hours
Wales: 0 hours
Wallis and Futuna Islands: +12 hours
Windward Islands: -4 hours

Yemen: +3 hours
Yugoslavia: +1 hour

Zaire Kasai: +2 hours
Zaire Kinshasa Mbandaka: +1 hour
Zaire Haut Zaire: +2 hours
Zaire Kivu: +2 hours
Zaire Shaba: +2 hours
Zambia: +2 hours
Zimbabwe: +2 hours