Mercury's rotation period (that is, one rotation period) is about 59 Earth days. The period of revolution (period of revolution) of Mercury is about 88 Earth Days. This means that it takes about 88 Earth days for Mercury to revolve around the sun.

In order to calculate the time when two points meet again, we can find the least common multiple of mercury and the sun. The least common multiple is the smallest number divisible by two numbers at the same time.

The least common multiple (LCM) can be calculated by dividing the product of two numbers by their greatest common divisor (GCD).

For Mercury's rotation period (59 Earth Days) and period of revolution (88 Earth Days), we can calculate their least common multiple:

LCM(59，88) = (59 × 88) / GCD(59，88)

GCD (59,88) is the greatest common divisor of 59 and 88.

Calculate the least common multiple, and then we can convert the least common multiple into earth day or other units to get the time when two points meet again.

Please note that since the rotation of Mercury and period of revolution are not integer relations, the time for the two points to meet again will be somewhat complicated, and more complicated mathematical calculation methods may be needed to determine the exact time. What is provided above is a basic computing concept.