Top Qs
Timeline
Chat
Perspective
Establishment of a port
From Wikipedia, the free encyclopedia
Remove ads
Establishment of a port is the technical expression for the time that elapses between the moon's transit across the local meridian at new or full moon at a given place and the time of the next high water at that place. As an example in the UK, the interval (constant at any one place) may vary from 6 minutes (Harwich) to 11 hours 45 minutes (North Foreland) meaning that the time difference of high water between those two places is 21 minutes. At London Bridge it is 1 hour 58 minutes.[1] The term establishment of the port is identical to the obsolescent term High Water Full and Change (HWF&C) Full referring to the full moon and change referring to the new moon.[2] Before the creation of modern tide tables, it was a quick way of predicting the time of local high water. The moon’s passage at the local meridian is about 50 minutes later each day. If it is HWF&C 1 hour 30 minutes and we are three days after the full moon, then the morning high water is 1h 30 + 150 minutes = 0400.[3]
![]() | This article needs to be updated. (November 2010) |
Remove ads
External links
- "Establishment of the port". The Free Dictionary.
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads