Computations fail when latitude is too large.

[chessmasterhong]

Plugin breaks (fails in its computations) when the latitude becomes too large in both the positive and negative latitudes. In other words, as it approaches the North and South Poles, specifically around the Arctic and Antarctic Circles.

I believe this error is due to the higher latitudes having polar days and polar nights (no sunrise and sunset) of which the plugin currently does not account for. Future plans are to fix calculations and add support for arbitrary latitudes