Transition is always a moment celebrated by cultures (and not just human cultures). Transition between life and death, between childhood and adult life, between seasons, between day and night, etc. All generate particular culture behaviors, rituals, prescriptions.
Even architecture responds to these moments of transition. That is the case of many ditched enclosures by having their gates orientated to important sun annual events, such as solstices and equinoxes. In this case, we have a drawing of the landscape perspective of the sunset at the equinoxes, seen through the western gate of Bela Vista 5 enclosure (Beja, South Portugal).