Tower of Jericho

At midsummer sunset a mountain's shadow falls on the 8.5 m Tower of Jericho, then on the village.

The Tower of Jericho (Arabic: برج أريحا) is an 8.5-metre-tall (28 ft) stone structure…

The tower lines up with the solstice sunset. Is that strong evidence of intent, or could a staircase facing a nearby mountain line up by chance?