Answer:
To determine the local standard time in Chicago (90° W) based on the given satellite image time of "0900Z," we need to convert the Zulu time (Z) to the local time zone.
Zulu time, also known as Coordinated Universal Time (UTC), is a standard time reference used in aviation and military operations. It is based on the Prime Meridian (0° longitude) and does not account for local time zone variations.
To convert Zulu time to Chicago's local standard time, we need to consider the time difference between the Prime Meridian (0°) and Chicago's longitude (90° W).
Since each time zone covers approximately 15 degrees of longitude, we can calculate the time difference by dividing 90° by 15°:
90° / 15° = 6 hours
Chicago is 6 hours behind UTC or Zulu time.
Therefore, to determine the local standard time in Chicago, we subtract 6 hours from the given Zulu time of "0900Z":
0900Z - 6 hours = 0300 local standard time in Chicago
So, the local standard time in Chicago at the moment the satellite image was taken at "0900Z" would be 0300 (3:00 AM).