# AstroPhotosGY

> Free astronomy Learn lessons and browser tools. Built in Guyana (~6°N). Works worldwide with any lat/lon. Tonight score: Go / Maybe / Skip from cloud, dew, transparency, and dark windows.

## Core

- [Home](https://astrophotosgy.com/): Free astronomy tools and STEM lessons — built in Guyana, used worldwide
- [Tools](https://astrophotosgy.com/tools): Free astronomy and astrophotography web tools
- [Tonight Score](https://astrophotosgy.com/tools/tonight-score): Is tonight good for stargazing? 0–100 Go / Maybe / Skip
- [Learn](https://astrophotosgy.com/learn): Free STEM astronomy lessons with interactive demos
- [Locations](https://astrophotosgy.com/locations): Tonight city hubs for weather, dark sky, and ISS
- [FAQ](https://astrophotosgy.com/faq): Common questions
- [About](https://astrophotosgy.com/about): Team and mission

## Live tools

- [Tonight Observing Score](https://astrophotosgy.com/tools/tonight-score): Go / Maybe / Skip decision score
- [Stargazing Weather](https://astrophotosgy.com/tools/stargazing-weather): Hourly clouds, dew, transparency, 7-night outlook
- [Dark Sky Finder](https://astrophotosgy.com/tools/dark-sky-finder): Bortle / light pollution map
- [Dark Sky Window](https://astrophotosgy.com/tools/dark-sky-window): Sun/moon times and moonless dark
- [ISS Pass Predictor](https://astrophotosgy.com/tools/iss-passes): Spottable ISS passes any location
- [Planet Visibility Tonight](https://astrophotosgy.com/tools/planet-visibility): Naked-eye planets
- [Milky Way Season Planner](https://astrophotosgy.com/tools/milky-way-season-planner): Galactic core season by latitude
- [Milky Way Field Guide](https://astrophotosgy.com/tools/mw-field-guide): Printable field PDF
- [Star Trail Session Planner](https://astrophotosgy.com/tools/star-trail-planner): Trail arcs any latitude
- [Solar Pinhole Camera](https://astrophotosgy.com/tools/pinhole-camera): Solargraph simulator
- [Pinhole Optics Calculator](https://astrophotosgy.com/tools/pinhole-calculator): Hole size and spot size

## Learn Start here

- [Is Tonight Good for Stargazing?](https://astrophotosgy.com/learn/is-tonight-good-for-stargazing): Score bands and decision checklist
- [How to See the Milky Way](https://astrophotosgy.com/learn/how-to-see-milky-way): Dark site, moon, season, weather
- [Best Time to Stargaze Tonight](https://astrophotosgy.com/learn/best-time-to-stargaze-tonight): Dark window aligned with clear hours
- [Can I See the Milky Way Tonight?](https://astrophotosgy.com/learn/can-i-see-milky-way-tonight): Season, Moon, weather, site gates
- [Is the ISS Visible Tonight?](https://astrophotosgy.com/learn/is-iss-visible-tonight): Spottable passes and weather gate
- [Tropical Milky Way Season](https://astrophotosgy.com/learn/tropical-milky-way-season): Equatorial core season + monsoon
- [How Tonight Score Is Weighted](https://astrophotosgy.com/learn/tonight-score-methodology): Transparent 0–100 methodology
- [Bortle / Dark Skies for Beginners](https://astrophotosgy.com/learn/bortle-dark-skies-beginners): Find darker pins near you
- [First Night Checklist](https://astrophotosgy.com/learn/stargazing-first-night-checklist): Beginner field funnel

## Comparisons

- [Best Free Stargazing Weather Tools (2026)](https://astrophotosgy.com/learn/best-free-stargazing-weather-tools-2026)
- [Clear Outside Alternative](https://astrophotosgy.com/learn/clear-outside-alternative)
- [PhotoPills Free Alternative (MW)](https://astrophotosgy.com/learn/photopills-free-alternative-milky-way)
- [Free ISS Tracker Comparison](https://astrophotosgy.com/learn/free-iss-tracker-comparison)

## Tonight cities

- [Georgetown](https://astrophotosgy.com/tonight/georgetown): Guyana · Demerara-Mahaica · ~6.8°N
- [Bartica](https://astrophotosgy.com/tonight/bartica): Guyana · Cuyuni-Mazaruni · dark-sky gateway
- [Lethem](https://astrophotosgy.com/tonight/lethem): Guyana · Rupununi · ~3.4°N
- [Mahdia](https://astrophotosgy.com/tonight/mahdia): Guyana · Potaro-Siparuni · interior
- [Mabaruma](https://astrophotosgy.com/tonight/mabaruma): Guyana · Barima-Waini · north-west
- [Paramaribo](https://astrophotosgy.com/tonight/paramaribo): Suriname · Suriname coast · ~5.9°N
- [Port of Spain](https://astrophotosgy.com/tonight/port-of-spain): Trinidad and Tobago · Trinidad · ~10.7°N
- [Kingston](https://astrophotosgy.com/tonight/kingston): Jamaica · Jamaica · ~18.0°N
- [Nairobi](https://astrophotosgy.com/tonight/nairobi): Kenya · East Africa · ~1.3°S
- [Lagos](https://astrophotosgy.com/tonight/lagos): Nigeria · Gulf of Guinea · ~6.5°N
- [Accra](https://astrophotosgy.com/tonight/accra): Ghana · Gulf of Guinea · ~5.6°N
- [Addis Ababa](https://astrophotosgy.com/tonight/addis-ababa): Ethiopia · Ethiopian Highlands · ~9.0°N
- [Cape Town](https://astrophotosgy.com/tonight/cape-town): South Africa · Western Cape · ~33.9°S
- [Windhoek](https://astrophotosgy.com/tonight/windhoek): Namibia · Khomas · ~22.6°S
- [Bogotá](https://astrophotosgy.com/tonight/bogota): Colombia · Andes · ~4.7°N
- [Quito](https://astrophotosgy.com/tonight/quito): Ecuador · Andes · ~0.2°S
- [Lima](https://astrophotosgy.com/tonight/lima): Peru · Pacific coast · ~12.0°S
- [Santiago](https://astrophotosgy.com/tonight/santiago): Chile · Central Chile · ~33.4°S
- [La Serena](https://astrophotosgy.com/tonight/la-serena): Chile · Coquimbo · astronomy coast
- [Buenos Aires](https://astrophotosgy.com/tonight/buenos-aires): Argentina · Río de la Plata · ~34.6°S
- [São Paulo](https://astrophotosgy.com/tonight/sao-paulo): Brazil · Southeast Brazil · ~23.6°S
- [Mexico City](https://astrophotosgy.com/tonight/mexico-city): Mexico · Valley of Mexico · ~19.4°N
- [Tucson](https://astrophotosgy.com/tonight/tucson): United States · Arizona · dark-sky city
- [Flagstaff](https://astrophotosgy.com/tonight/flagstaff): United States · Arizona · first International Dark Sky City
- [Hilo](https://astrophotosgy.com/tonight/hilo): United States · Hawaiʻi Island · windward
- [Los Angeles](https://astrophotosgy.com/tonight/los-angeles): United States · Southern California · ~34.1°N
- [New York](https://astrophotosgy.com/tonight/new-york): United States · Northeast · ~40.7°N
- [Denver](https://astrophotosgy.com/tonight/denver): United States · Colorado Front Range · ~39.7°N
- [London](https://astrophotosgy.com/tonight/london): United Kingdom · England · ~51.5°N
- [Paris](https://astrophotosgy.com/tonight/paris): France · Île-de-France · ~48.9°N
- [Berlin](https://astrophotosgy.com/tonight/berlin): Germany · Brandenburg · ~52.5°N
- [Madrid](https://astrophotosgy.com/tonight/madrid): Spain · Central Spain · ~40.4°N
- [Rome](https://astrophotosgy.com/tonight/rome): Italy · Lazio · ~41.9°N
- [Singapore](https://astrophotosgy.com/tonight/singapore): Singapore · Southeast Asia · ~1.4°N
- [Jakarta](https://astrophotosgy.com/tonight/jakarta): Indonesia · Java · ~6.2°S
- [Bangkok](https://astrophotosgy.com/tonight/bangkok): Thailand · Central Thailand · ~13.8°N
- [Manila](https://astrophotosgy.com/tonight/manila): Philippines · Luzon · ~14.6°N
- [Kuala Lumpur](https://astrophotosgy.com/tonight/kuala-lumpur): Malaysia · Peninsular Malaysia · ~3.1°N
- [Tokyo](https://astrophotosgy.com/tonight/tokyo): Japan · Kantō · ~35.7°N
- [Seoul](https://astrophotosgy.com/tonight/seoul): South Korea · Korean Peninsula · ~37.6°N
- [Mumbai](https://astrophotosgy.com/tonight/mumbai): India · Konkan coast · ~19.1°N
- [Delhi](https://astrophotosgy.com/tonight/delhi): India · Indo-Gangetic Plain · ~28.7°N
- [Sydney](https://astrophotosgy.com/tonight/sydney): Australia · New South Wales · ~33.9°S
- [Melbourne](https://astrophotosgy.com/tonight/melbourne): Australia · Victoria · ~37.8°S
- [Auckland](https://astrophotosgy.com/tonight/auckland): New Zealand · North Island · ~36.9°S
- [Caracas](https://astrophotosgy.com/tonight/caracas): Venezuela · Capital District · ~10.5°N
- [Havana](https://astrophotosgy.com/tonight/havana): Cuba · La Habana · ~23.1°N
- [Santo Domingo](https://astrophotosgy.com/tonight/santo-domingo): Dominican Republic · Ozama · ~18.5°N
- [Bridgetown](https://astrophotosgy.com/tonight/bridgetown): Barbados · St. Michael · ~13.1°N
- [Dar es Salaam](https://astrophotosgy.com/tonight/dar-es-salaam): Tanzania · Indian Ocean coast · ~6.8°S
- [Kampala](https://astrophotosgy.com/tonight/kampala): Uganda · Lake Victoria · ~0.3°N
- [Johannesburg](https://astrophotosgy.com/tonight/johannesburg): South Africa · Highveld · ~26.2°S
- [Marrakesh](https://astrophotosgy.com/tonight/marrakesh): Morocco · Haouz · ~31.6°N
- [Rio de Janeiro](https://astrophotosgy.com/tonight/rio-de-janeiro): Brazil · Guanabara · ~22.9°S
- [Cusco](https://astrophotosgy.com/tonight/cusco): Peru · Andes · ~13.5°S · ~3400 m
- [Vancouver](https://astrophotosgy.com/tonight/vancouver): Canada · Pacific Northwest · ~49.3°N
- [Chicago](https://astrophotosgy.com/tonight/chicago): United States · Great Lakes · ~41.9°N
- [Miami](https://astrophotosgy.com/tonight/miami): United States · South Florida · ~25.8°N
- [Amsterdam](https://astrophotosgy.com/tonight/amsterdam): Netherlands · North Holland · ~52.4°N
- [Athens](https://astrophotosgy.com/tonight/athens): Greece · Attica · ~38.0°N
- [Dubai](https://astrophotosgy.com/tonight/dubai): United Arab Emirates · Persian Gulf · ~25.2°N
- [Hong Kong](https://astrophotosgy.com/tonight/hong-kong): China · Pearl River Delta · ~22.3°N
- [Denpasar](https://astrophotosgy.com/tonight/denpasar): Indonesia · Bali · ~8.7°S
- [Perth](https://astrophotosgy.com/tonight/perth): Australia · Western Australia · ~31.9°S
- [Christchurch](https://astrophotosgy.com/tonight/christchurch): New Zealand · South Island · ~43.5°S

## Optional

- [Sitemap](https://astrophotosgy.com/sitemap.xml)
- Brand line — Built in Guyana. Works worldwide.