"propitious omens"; "propitious gales speeded us along"; "a propitious alignment of planets for space exploration"
is similar to
presaging or likely to bring good luck
"a favorable time to ask for a raise"; "lucky stars"; "a prosperous moment to make a decision"
is similar to
disposed to bestow favors
"thanks to the gracious gods"
see also
auguring favorable circumstances and good luck
"an auspicious beginning for the campaign"
see also
(of winds or weather) tending to promote or facilitate
"the days were fair and the winds were favorable"
is an attribute of
the favorable quality of strongly indicating a successful result