This constellation appears at the time of the autumnal equinox, when days and nights are equal.
(This constellation; appears; T:at the time of the autumnal equinox) (days and nights; are; equal; T:the time of the autumnal equinox)
This constellation days and nights
appears are
T:at the time of the autumnal equinox
equal T:the time of the autumnal equinox