Related Clues:

• Noon to noon
• Appointment-calendar page, perhaps
• Word with trip or light
• "Let's call it a ___"
• Week component
• Every second from a diary unit?
• Square on a calendar
• Desk-calendar page
• Tide may change between sunrise and sunset
• Light diet may be ordered
• When tide may be out
• Period between dawn and dusk
• One of seven in a week
• Generally preferred work shift
• Light interval