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Standard Time The time system that uses time zone boundaries marked by government and geographical considerations, such as Pacific Standard Time, Eastern Standard Time. Each time zone is roughly 15° of longitude wide, but large discrepancies can be found. Places that switch from standard time to daylight saving time, change the zone description of their time zone by one hour during the summer half of the year. The standard time zone that applies to a particular place (and whether they switch to daylight saving time) can be looked up in the back of the Nautical Almanac, but there is no practical navigational need to know this - other than helping a thirsty navigator guess whether the Pioneer Inn in Lahaina, or equivalent stations around the world, might still be open when you arrive. See Greenwich Mean Time, Watch Time, Zone Time, Zone Description. See: sextant sight, standard time, time zone, universal time, watch error, watch rate, watch time, zone description, and zone time. See also: Time Keeping in Navigation and Weather.

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