EASA NAV(A)intermediate
Explain why UTC, local mean time, and local standard time can differ.
Answer
UTC is the common reference time. Local mean time is based on the Sun's apparent relationship to the local meridian and therefore varies with longitude. Standard time is a civil time-zone convention and may be shifted by daylight-saving time.
Explanation
UTC is standardized globally for operational coordination. Local mean time changes with longitude because local solar time advances eastward, while standard time is defined by time zones and may be seasonally adjusted. **Key takeaway:** UTC is standardized; LMT and civil time are locally dependent.\n\n**Glossary:** **LMT**: local mean time; **standard time**: official civil time for a zone; **daylight saving time**: seasonal civil-time shift.
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