This is not just Father’s Day and the solstice weekend, but also the New Moon. It starts what astronomers call a new lunation – day zero of the lunar month. A new moon is utterly invisible because it displays only its dark side and also sits near the sun in the daytime sky, lost in glare. But in popular speech many define "new moon" as the skinny crescent, first seen two evenings later. Millions around the world will then look for the reappearance of the moon as a thin crescent.