The term 'Start of the Day' can be described by two crossword solutions: DAWN (4 letters) and SUNUP (5 letters). DAWN is the time of day when the sky begins to lighten, signaling the start of a new day. SUNUP is the time when the sun rises above the horizon, usually accompanied by the appearance of the first rays of sunlight. Both terms refer to the beginning of the day, when the sun is just beginning to rise.