Word of the (Solstice) day: "grimmelings", also "grimplins", "grimlins"––the first & last gleams of daylight (Scots, esp. Orkney), which around midsummer in northern latitudes blend to form the "simmer dim" (summer twilight). Cf Swedish "grim(b)la", "to glimmer before the eyes". (via @RobGMacfarlane)