Was het donker?

Heatmap created for Was het Donker?, a citizen science project in The Netherlands to monitor light pollution. The visualization shows the monthly sky brightness and moon phase for the various Sky Quality Meters (SQM).

All monthly visualizations can be found on the Washetdonker website

Some examples:

---

Hulshorst (my back yard 🏡)

---

Rijswijk (urban area with greenhouses 🌃)

---

Vlieland (rural area on sparsely populated island 🌌)