The standard clock will be zeroed with which time source?

The standard clock will be zeroed with which time source?

• A. GPS time
• B. US Naval Observatory time
• C. UTC
• D. Local time

Answer: (B)

The standard clock is disciplined to the official US Naval Observatory time. This provides the authoritative, auditable time base that DoD timing systems trace to. While GPS time is highly precise and UTC is the civil time scale, the primary reference used to zero the standard clock is USNO time because it is the designated national/time authority that ensures uniform, globally recognized timekeeping for military use. Local time isn’t suitable since it varies by location, and GPS time isn’t the official standard the service uses for zeroing.

The standard clock is disciplined to the official US Naval Observatory time. This provides the authoritative, auditable time base that DoD timing systems trace to. While GPS time is highly precise and UTC is the civil time scale, the primary reference used to zero the standard clock is USNO time because it is the designated national/time authority that ensures uniform, globally recognized timekeeping for military use. Local time isn’t suitable since it varies by location, and GPS time isn’t the official standard the service uses for zeroing.