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| | Z-Time - by Harold F. Maybeck |
 | | This notation, "Z", is appended to times on most navigational, meteorological, and astronomical charts today to indicate that the time of the chart is in "Greenwich Mean Time". |
 | | The first zone centered on 15° West longitude became time zone "N", the next time zone west centered on 30° West longitude became time zone "O", etc, etc. Approaching the International Date Line from the east, Bowditch designated the remaining "half zone" from 172.5° West longitude to 180° longitude as time zone "Y". |
 | | The "original" expression "In jig time" was a sailors expression, meaning "in no time at all", because there is no "JIG" time zone. |
| www.maybeck.com /ztime (941 words) |
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