How GoodDayTo judges stargazing weather
For stargazing, daytime sunshine is irrelevant; what matters is the night sky. GoodDayTo combines the upcoming weather with astronomical darkness and moon context, so a clear but bright moonlit or twilight hour is treated differently from a truly dark clear window.
- Astronomical darkness
- Moon illumination
- Moonrise / moonset
- Cloud cover
- Precipitation
- Wind
🌞 Make the most of the good window
- Travel away from city lights when practical and safe.
- Allow your eyes time to adapt to darkness.
- The live score now includes moon brightness and true astronomical darkness. Local light pollution and atmospheric seeing are still outside the score and are not guessed.
What makes the best stargazing window
A clear sky is necessary but not always sufficient. GoodDayTo combines cloud and precipitation with true astronomical darkness and moon context. A bright moon above the horizon can wash out faint galaxies and nebulae even when the sky is cloudless, while the same night may become much better after moonset. That is why the tool searches upcoming hours rather than judging the whole night from sunset conditions.
If you are observing the Moon, planets or bright star clusters, you may personally accept a moonlit window that scores lower for deep-sky observing. Give your eyes time to adapt to darkness and, where practical, move away from direct street lighting.
What the stargazing score cannot know
GoodDayTo does not currently measure local light pollution, atmospheric seeing, haze transparency, smoke, nearby obstructions or whether clouds are concentrated on the particular part of the sky you want to observe. Astronomy data and weather forecasts can identify a promising window, but a quick visual sky check at the location is still valuable before travelling far.
What the score means
GO means the weather signals we can measure look favourable. WAIT means conditions are mixed and a better hour may be nearby. NOT TODAY means the forecast currently contains enough unfavourable signals that this activity is unlikely to be a good weather choice. These are planning recommendations, not safety clearances.
Stargazing example: darkness and cloud must overlap
A clear afternoon does not help if cloud arrives after dark, and a cloud-free evening can still be less useful when bright moonlight dominates the target hours. GoodDayTo waits for darkness and moon information before scoring Stargazing, then looks for a usable night window. Local light pollution, haze, horizon obstructions and telescope setup are not measured by the weather score.
Frequently asked questions
How important is cloud cover for stargazing?
Very important. Even when it is dry and calm, thick cloud can block the sky, so cloud cover has a strong effect on the stargazing score.
Does the score consider the Moon?
Yes. GoodDayTo uses moon position and illumination as extra context because a bright Moon can reduce contrast for faint stars and deep-sky objects.
Why does the tool care about astronomical darkness?
A clear sky is not enough if the Sun is still too close to the horizon. GoodDayTo uses twilight information so a bright evening is not mistaken for a prime stargazing window.
Does the score know how much light pollution is around me?
Not yet. Streetlights, city glow and your exact viewing spot can make a large difference, so a high weather score does not guarantee a dark sky.
Can GO guarantee I will see stars or a meteor shower?
No. GO means the weather and darkness factors look favourable. Visibility of specific objects also depends on light pollution, the object’s position, your equipment and the astronomical event itself.