This year's only total solar eclipse will cross South America on Monday (Dec. 14), and you can watch the spectacle unfold online thanks to a host of webcasts — no special safety glasses needed.The broadcasts are particularly fortunate, given that the ongoing COVID-19 pandemic means eclipse-chasing is not safe this year. The eclipse will begin at 8:33 a.m. EST (1333 GMT) and conclude at 1:53 p.m. EST (1853 GMT), with totality lasting at most 2 minutes and 10 seconds. The narrow path of totality will cross from Saavedra, Chile, to Salina del Eje, Argentina; otherwise the total eclipse will cross...