Final answer:
The analemma can be used to readily recalculate the time of sunrise by determining the position of the Sun on the analemma.
Step-by-step explanation:
The analemma can be used to readily recalculate the time of sunrise. The analemma is a figure-eight-shaped curve that represents the apparent motion of the Sun in the sky throughout the year. By determining the position of the Sun on the analemma, one can determine the time of sunrise for any given day.