Outdoor Glossary: J
J1
smaller lunar elliptic diurnal constituent. This constituent,
with M1, modulates the amplitudes of the declinational K1, for the effect of the
Moon's elliptical orbit. Speed = T + s + h - p = 15.585,443,3 per solar hour.
Japan Current
Same as Kuroshio
jaws
Part of the mouth supporting the teeth
jetty
(fishing) Fishing from a manmade pier or rock formation that
extends into a body of water
jetty
(1) On open seacoasts, a structure extending into a body of
water to direct and confine the stream or tidal flow to a selected CHANNEL, or
to prevent shoaling. Jetties are built at the mouth of a river or ENTRANCE to a
BAY to help deepen and stabilize a CHANNEL and facilitate navigation. (2) (SMP)
A structure usually projecting out into the SEA at the mouth of a river for the
purpose of protecting a navigational channel, a harbor or to influence water
currents.
jigging
A method of catching squid by using hook and lines which
are continuously lowered and howled. Jigging machines do this automatically on
modern fishing vessels
jigging reels
A reel that has the ability to present artificial
lures in short, jerking motions.
jugulum
Front part of the neck. Synonym(s): foreneck, throat,
throat patch. In picture it is referred to as foreneck.
julian calendar
A calendar introduced by Julius Caesar in the year
45 B.C., and slightly modified by Augustus a few years later. This calendar
provided that the common year should consist of 365 days and that every fourth
year, now known as a bissextile or leap year, should contain 366 days, making
the average length of the year 365.25 days. It differs from the modern or
Gregorian calendar in having every fourth year a leap year, while in the modern
calendar century years not divisible by 400 are common years. See Gregorian
calendar.
julian date
Technique for the identification of successive days of
the year when monthly notation is not desired. This is especially applicable in
computer data processing and acquisition where library indexing is
necessary.
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