International Day of Light 2021

International Day of Light celebrates light science and its applications in culture, education and sustainable development.

Frequently asked questions

When is International Day of Light 2021?

International Day of Light 2021 is on Sunday, 16 May 2021.

What day of the week is International Day of Light 2021?

It falls on Sunday.

How is International Day of Light calculated?

This event is observed every year on 16 May.