Experts say it will be the deepest partial solar eclipse in almost three decades. Tréasa expects Donegal to see around 93 to 95 per cent coverage of the sun and warned “there is never a safe time to look directly at the sun”. Experts claimed there will not be another deep solar eclipse of the same scale over Ireland until September 23, 2090, when a total solar eclipse is calculated to be visible. Advertisement“This is a partial eclipse, so the sun will not disappear completely from view we will not experience the dramatic darkness associated with totality. He added: “The most important thing is to never look directly at the sun without proper solar eye protection.