We want the secondary entries to sort on the variant name, not the current circle's name, but the latitude and longitude are the same as the primary circle.
# - - - S e c I n d e x . _ _ i n i t _ _
def __init__(self, db, priIndex, variant, firstYear=MIN_YEAR,
lastYear=MAX_YEAR):
'''Constructor.
'''
#-- 1
# [ self := a BaseIndex instance with db=(db) and
# circle=(circle) ]
self.priIndex = priIndex
self.variant = variant
self.circle = priIndex.circle
self.firstYear = firstYear
self.lastYear = lastYear
BaseIndex.__init__(self, db, variant, self.circle.lat,
self.circle.lon)