What to expectA solar eclipse happens when the moon moves directly between the earth and the sun, blocking its light. Solar eclipse over Ardara, County Donegal in 2015. That said, viewing events have been arranged to take place all over the country. Other free events require booking ahead of time, as spaces are limited. Anyone looking directly at the sun should wear certified ISO 12312-2 eclipse glasses, as ordinary sunglasses do not offer adequate protection.