Sources and licences
Every data source behind PolarPeek, with its licence and the credit it asks for.
PolarPeek relies only on official and openly licensed sources. We do not use paid data and do not redistribute anyone’s raw files.
| Data | Source | Licence / terms |
|---|---|---|
| Kp index, 3-day Kp forecast, OVATION aurora model | NOAA Space Weather Prediction Center | US government work, public domain. Credit: NOAA SWPC. No endorsement implied. |
| Kp archive since 1932 | GFZ Helmholtz Centre for Geosciences, Potsdam · Matzka et al. (2021), doi:10.5880/Kp.0001 | CC BY 4.0. The sunspot numbers in the same file (CC BY-NC) are not used. |
| Cloud cover forecast | MET Norway, Locationforecast | CC BY 4.0 and NLOD 2.0. Data from MET Norway. |
| ISS trajectory | NASA, ISS Trajectory Data | US government work, public domain. |
| Positions, phases, eclipses, seasons | astronomy-engine by Don Cross | MIT licence. |
| Meteor shower parameters | International Meteor Organization working list | Facts; our own text. |
| Constellation boundaries and names | International Astronomical Union | Facts; our own text. |
| Fonts | Fraunces, Inter Tight via Fontsource | SIL Open Font License 1.1. |