When was the worst eclipse?

Answer 1

Eclipses do not cause any ill effects on the Earth; there is no "worst", perhaps in terms of visibility.

You can look up all eclipses from the year 2000 BC to 3000 AD at the NASA Eclipse web page.

Answer 2

It is subjective to determine the "worst" eclipse, but a notable one was the March 20, 2015 total solar eclipse visible from the North Atlantic, the Faroe Islands, and Svalbard. This eclipse experienced poor weather conditions in many areas, making viewing difficult for many people.