Your intelligent stargazing forecast

Frequently asked questions

How does Starglow predict stargazing conditions?

Starglow analyzes cloud coverage at multiple altitudes (high, mid, and low-level clouds) along with real-time visibility conditions to predict stargazing quality. The app provides hour-by-hour forecasts so you can plan the best viewing window throughout the night.

What factors affect stargazing quality?

The biggest factors are cloud coverage at different altitudes, atmospheric visibility, and time of night. Even thin high-altitude clouds can obscure faint stars, which is why Starglow breaks down cloud cover into high, mid, and low layers for a detailed sky assessment.

How accurate are Starglow's forecasts?

Starglow's forecasts are powered by high-resolution weather models from leading national weather services, with local resolution as fine as 1–2 km. These models are updated every hour and incorporate real-time data from satellites, radar, weather stations, and atmospheric observations. For stargazing, accurate cloud coverage data is critical, and Starglow delivers multi-layer cloud predictions at each altitude level. We recommend checking the hour-by-hour timeline close to your planned viewing time for the most up-to-date conditions.

Can Starglow track the International Space Station?

Yes! Starglow includes ISS visibility predictions for your location, so you'll know exactly when the International Space Station will be visible overhead. It's one of the brightest objects in the night sky and easy to spot with the right timing.

What is the timeline view in Starglow?

The timeline is a scrollable hour-by-hour grid that shows cloud coverage and viewing quality predictions throughout the night. It lets you quickly find the clearest windows for stargazing without scrolling through individual hourly forecasts.

Is Starglow available on Android?

Starglow is currently available exclusively on iOS. You can download it from the Apple App Store.

Can I use Starglow with Alpenglow?

Absolutely! Starglow and Alpenglow make perfect companions. Use Alpenglow to catch stunning sunrises and sunsets, then switch to Starglow when night falls to find the best stargazing conditions. Together they cover the entire sky-watching experience.

What cloud coverage data does Starglow show?

Starglow displays total cloud coverage along with a detailed breakdown of high, mid, and low-level clouds. This layered view helps you understand exactly what's happening in the atmosphere. High clouds might still allow planet watching, while low clouds can block everything.