Final answer:
It is true that you can calculate the time and day of a given location using central meridians.
Step-by-step explanation:
The statement is true. By using central meridians, you can calculate the time and day of a given location. The Earth is divided into 24 time zones, with each zone corresponding to 15 degrees of longitude.
Each time zone is centered around a central meridian, which represents the standard time for that zone. So, by knowing the central meridian for a location, you can determine the time and day for that place.