sentences:  It takes between 1226 and 1550 years for the members of a saros series to traverse the Earth's surface from north to south (or vice versa).These extremes allow from 69 to 87 eclipses in each series (most series have 71 or 72 eclipses).From 39 to 59 (mostly about 43) eclipses in a given series will be central (that is, total, annular, or hybrid annular-total).