CRONUS
Page 8
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
HOW A TIDE CLOCK WORKS
It has been known for centuries that up and down the east coast, tides occur approximately 50 minutes
later each day than they did the day before. The primary reason for this daily lag can be traced to the
moon. It takes the earth 24 hours to make one complete rotation in relation to the sun. This rotation is
called a “solar day”. It takes the moon 24 hours and 50 minutes to make one complete rotation around
the earth. This rotation is called a “lunar day”. It is the moon’s close proximity to us and the relatively
strong gravitational effect it has on the earth that causes the tides to follow the moon’s lunar schedule of
24 hours and 50 minutes per cycle.
While this lunar cycle is the primary force behind the workings of the tide, it is not the only force. On a
daily basis the average tidal cycle of 24 hours and 50 minutes can be affected by such cosmic variables
as the relative position of the earth to the sun and the specific elliptical pattern of the moon around the
earth. Localized variables affecting daily tides also exist. These would include strong winds, changes in
atmospheric pressure, distant storms and an infinite number of other atmospheric conditions. The total
affect of all these different factors cause tides to vary around the average point of 24 hours and 50
minutes. These variations can cause the reading of your tide clock to be either fast or slow in relation to
actual tides, by as much as one hour or more on any given day. However, the rhythmic 24 hour and 50
minute cycle will prevail over any given 28 day lunar period. Basically what all this means, is that on any
give day the clock may read fast or slow, but over a 28-day period it will average itself out to be correct.
For most purposes, high and/or low tide is not really a point in time, but a condition that exists over a
period of time. If for some reason you require exact tide information you should always refer to a current
tide table. The purpose of a tide clock is not to be exact, but to tell us the best approximate time to go
swimming, fishing, boating, etc. For these functions a tide clock works just fine.
TROUBLESHOOTING
Latch Up
Power Line disturbances, improper powering up or an error in wiring may cause a blank or improper
display reading. If Cronus is "latched up" in this way, proceed as follows:
1. Unplug the AC adapter from the 110 VAC power outlet.
2. Wait 15 seconds.
3. Plug the AC adapter in to the 110 VAC power outlet.
ADDITIONAL INFORMATION
INFORMATION FOR THE CRONUS USER
WARNING: Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
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Reorient or relocate the receiving antenna.
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Increase the separation between the equipment and receiver.
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Connect the equipment into an outlet on a circuit different from that to which the receiver is
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