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Tidal Clock
And How Tide Clocks Work
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Whatever your relationship with the sea, it is always important and useful to know the current position of the tide. Buy one of these tidal clocks for yourself or as a gift to someone who enjoys sailing, fishing or simply being near the sea, and you'll be getting something that will be useful for many years to come.
How does a tide clock work?
Due to the fact that the gravitational pull of the moon on the oceans is the major influence on the tides, tidal clocks work by timing the aparent motion of the moon around the earth. The actual true orbit of the moon takes 29 days, 12 hours, 44 minutes and 2.8 seconds, (ie 29.53 days) but as the earth is spinning on its own axis too, the moon appears to rise and set every day as the earth turns, in a similar way to how the sun appears to rise and set every day. The direction of the moon's actual 29.53 day cycle around the earth is the same direction as the turn of the earth''s axis. Therefore by the time the earth has turned once on its axis (which takes 24 hours), the moon has advanced around the earth a little. The advance of the moon in one day is 1/ 29.53 of its full cycle. The planet earth must therefore rotate for another 1/29.53 of a day (48.76 minutes) to arrive at where the moon was after the earth's initial 24 hour turn. You can take this further by realising that after these extra 48.76 minutes of the earth's travel, the moon has again moved forward a little more, but we're now getting into such exact figures that become slightly inappropriate when talking about the tide, as, although it the sun's influence is much less than that of the moon when it comes to tidal flow, the position of the sun does also have a small influence on the tidal flows.The sun's effect on the timing of tides is greates at times of the last quarter and first quarter of the moon. At this point the moon and sun are at right angles to each other when viewed from earth. This causes the high tides to be lower than usual, and low tides to be higher than usual, and can cause differences of up to half an hour in expected high and low tide times. Effectively then, we're talking about a period of around 24 hours 48.7 minutes between the moon appearing in the same part of our sky when viewed from earth. At first thought it would appear that this would give only one high tide per day, but in most areas there are actually two high tides and two low tides each day. This is due to the effects of gravitation on the solid body of the planet earth, and also the effect of centrifugal forces. The earth and moon actually have a combined centre of gravity around which both planetary objects circle. This center of gravity is not out there in space between the two bodies, but is actually inside the earth, as a result of the earth's much larger mass than the moon. This center of gravity, which is always in the direction of the moon, and the earth wobbles around this center, meaning that the side of the earth furthest away from the moon experiences a centrifugal force which pushes the liquid water of the seas outward. This effect is combined with the fact that the gravitational pull of the moon pulls the solid body of the earth, including the sea floor on the opposite side of the moon, toward the moon itself. The elipse of water, being liquid rather than a solid mass, is therefore higher on both the side closest and furthest to the moon. With two tides in one apparent orbit of the moon around the earth, and a period of 24 hours 48.7 minutes for each of these orbits, this gives a perion of around 12 hours 24 minutes between successive high tides. This is the time that it takes for tidal clocks to complete one rotation of their tide hand from one high tide to the next. On the opposite side of the high tide indicator, there is a low tide indicator, and most clocks also show a count-down style of "hours until high tide" and "hours until low tide". In many cases the tide clock will be combined with a normal 12 hour clock, either in an inner or outer ring of digits on the clockface. This can give you a total of up to 4 hands on the clock, which may look a little confusing at first. It's easy really though they're just the normal hour, minute and second hand which display the actual time of day, plus there's the extra hand for the tidal clock. |
 The New Complete Keyboard PlayerBook and CD set! All three parts of Kenneth Baker?s best-selling method, revised and fully updated, in one complete volume with a CD! Everything you require to know to get the most out of your electronic keyboard. Based on popular songs and with simple-to-follow text and diagrams, it assumes no previous knowledge of the keyboard or music. Includes great songs by Bryan Adams, Abba, The Beatles, David Bowie, Coldplay, Bob Dylan, Elton John, Simon and Garfunkel, Cat Stevens, Travis, Westlife and Robbie Williams. Part one includes? Playing technique and style About your keyboard The accompaniment section Single-finger and fingered chords Using synchro-start Major and seventh chords 12 right hand notes Note name stickers And these hit songs? The 59th Street Bridge Song (Feelin' Groovy) Bad Moon Rising Blowin? In The Wind Bye Bye Love Can You Feel The Love Tonight Catch A Falling Star Do Wah Diddy Diddy Grandfather's Clock Mr Tambourine Man One More Night Rio Grande Seasons In The Sun Where Have All The Flowers Gone? White Rose Of Athens Yellow Part 2 includes? Sharps, flats and naturals 7 new right-hand notes Minor chords Dotted notes and syncopation Chord chart And these hit songs? Father and Son Get Back Hello farewell (There's No Place Like) Home For The Holidays How Deep Is Your Love I Can See Clearly Now I Have A Dream In The Midnight Hour Lemon Tree Lovin' You Mrs. Robinson Moonshadow Rock Around The Clock Sailing Scarborough Fair/Canticle The Star-Spangled Banner Stuck In The Middle With You The Tide Is High Turn When You Say Nothing At All marvellous Tonight Part three includes? Scales and keys Triplets Sixteenth notes Dotted rhythms More major, seventh and minor chords Chord chart And these hit songs? Angels Can?t Get You Out Of My Head Danny Boy (Everything I Do) I Do It For You Hava Nagila I?ll Be There For You (Theme from Friends) I?m A Believer In The Air Tonight Isn?t She Lovely Livin? La Vida Loca Mamma Mia Ob-La-Di, Ob-La-Da Reach She?s The One Space Oddity Star Wars (Main Theme) This Masquerade We'll Meet Again The Winner Takes It All Wooly Bully
$22.48
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 Ocean (Metal) - Here Where Nothing GrowsOcean: jl, Eric Brackett, Reuben J Little, Candy.Recording information: Bandsaw Recording, Portland, ME (08/2005).On their full-length debut, Portland, ME`s Ocean stand between doom metal`s insular, shadowy underworld and the relatively more expressive sounds of post-rock. In the three extended pieces on Here Where Nothing Grows -- 20 mins is the median length -- Ocean eke out every last resonating echo in the guitars, and roar with a wordless rage that`s as bleak as anything by Leviathan. There`s a cold wind blowing in from the sea on this album, and it`s never even heard of good news. But there`s also a deadly, dreary accuracy to Ocean`s sound that offers more than doom metal`s easy, powerful grasp. The snare drum is placed with deadly, dreary accuracy throughout Nothing Grows, and there`s a sense of Ocean`s internal clock in the waning, bass-heavy tick of "First Reign" or "Salt"`s surprisingly introspective sweep. Gentle notes ring out over an unsettled whine of distortion in "Fall" -- that`s before the downright demonic vocals appear -- and in its initial sequences "Salt" recommends the earliest primordial lunges of grunge before transitioning into an epic sweep closer to the exploration of Pelican. (In fact Ocean originally collaborated with Pelican producer Sanford Parker on Here Where Nothing Grows before scrapping those sessions and re-recording the album in their home town.) By integrating authentic introspection or the occasional blast of conventional riffing, Ocean avoid drifting into that doom metal ether where faceless souls compete to see who can play slower or scarier. Of course Nothing Grows still isn`t any kind of picnic. Its darkness lingers determinedly, like angels of death camping in your peripheral vision, and it offers no hope, only black ink and bones floating in the rising tide. But Here Where Nothing Grows is as musical as it is menacing, and that makes it doubly powerful. ~ Johnny Loftus Copyright (C) Muze Incorporated 2005. For personal use only. All rights reserved.
$14.19
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Ocean (Metal) - Here Where Nothing GrowsOcean: jl, Eric Brackett, Reuben J Little, Candy.Recording information: Bandsaw Recording, Portland, ME (08/2005).On their full-length debut, Portland, ME`s Ocean stand between doom metal`s insular, shadowy underworld and the relatively more expressive sounds of post-rock. In the three extended pieces on Here Where Nothing Grows -- 20 mins is the median length -- Ocean eke out every last resonating echo in the guitars, and roar with a wordless rage that`s as bleak as anything by Leviathan. There`s a cold wind blowing in from the sea on this album, and it`s never even heard of good news. But there`s also a deadly, dreary accuracy to Ocean`s sound that offers more than doom metal`s easy, powerful grasp. The snare drum is placed with deadly, dreary accuracy throughout Nothing Grows, and there`s a sense of Ocean`s internal clock in the waning, bass-heavy tick of "First Reign" or "Salt"`s surprisingly introspective sweep. Gentle notes ring out over an unsettled whine of distortion in "Fall" -- that`s before the downright demonic vocals appear -- and in its initial sequences "Salt" recommends the earliest primordial lunges of grunge before transitioning into an epic sweep closer to the exploration of Pelican. (In fact Ocean originally collaborated with Pelican producer Sanford Parker on Here Where Nothing Grows before scrapping those sessions and re-recording the album in their home town.) By integrating authentic introspection or the occasional blast of conventional riffing, Ocean avoid drifting into that doom metal ether where faceless souls compete to see who can play slower or scarier. Of course Nothing Grows still isn`t any kind of picnic. Its darkness lingers determinedly, like angels of death camping in your peripheral vision, and it offers no hope, only black ink and bones floating in the rising tide. But Here Where Nothing Grows is as musical as it is menacing, and that makes it doubly powerful. ~ Johnny Loftus Copyright (C) Muze Incorporated 2005. For personal use only. All rights reserved.
$16.60
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Ocean (Metal) - Here Where Nothing GrowsOcean: jl, Eric Brackett, Reuben J Little, Candy.Recording information: Bandsaw Recording, Portland, ME (08/2005).On their full-length debut, Portland, ME`s Ocean stand between doom metal`s insular, shadowy underworld and the relatively more expressive sounds of post-rock. In the three extended pieces on Here Where Nothing Grows -- 20 mins is the median length -- Ocean eke out every last resonating echo in the guitars, and roar with a wordless rage that`s as bleak as anything by Leviathan. There`s a cold wind blowing in from the sea on this album, and it`s never even heard of good news. But there`s also a deadly, dreary accuracy to Ocean`s sound that offers more than doom metal`s easy, powerful grasp. The snare drum is placed with deadly, dreary accuracy throughout Nothing Grows, and there`s a sense of Ocean`s internal clock in the waning, bass-heavy tick of "First Reign" or "Salt"`s surprisingly introspective sweep. Gentle notes ring out over an unsettled whine of distortion in "Fall" -- that`s before the downright demonic vocals appear -- and in its initial sequences "Salt" recommends the earliest primordial lunges of grunge before transitioning into an epic sweep closer to the exploration of Pelican. (In fact Ocean originally collaborated with Pelican producer Sanford Parker on Here Where Nothing Grows before scrapping those sessions and re-recording the album in their home town.) By integrating authentic introspection or the occasional blast of conventional riffing, Ocean avoid drifting into that doom metal ether where faceless souls compete to see who can play slower or scarier. Of course Nothing Grows still isn`t any kind of picnic. Its darkness lingers determinedly, like angels of death camping in your peripheral vision, and it offers no hope, only black ink and bones floating in the rising tide. But Here Where Nothing Grows is as musical as it is menacing, and that makes it doubly powerful. ~ Johnny Loftus Copyright (C) Muze Incorporated 2005. For personal use only. All rights reserved.
$15.99
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Landmark StatusLandmark Status careens madly through a subtropical tangle of legal actions, spirits, spells, kung fu, car wrecks, football, phobias, fetishes, wooden flutes, pet rabbits and vintage aircraft, whilst the fate of Miami?s famed Century Club hangs in the balance. Once a notorious nightspot, the Club just awoke from decades of slumbering decay?thanks to a local building boom. Now everybody?s scrambling to bury it under a fabulous high-rise. Lawyer Benjy Bluestone couldn?t care less, but a client owns the Club and seeks his help. It gets easier to say yes when he learns that beautiful broker Delia Torres is involved, even though she represents a developer who?s furious to find the Club?s been optioned to a rival. Benjy and Delia soon discover her client will stop at nothing to turn that option into ?something so ugly the tide won?t take it out.? Racing the clock, they join forces on the road to Opa-locka, where a violent confrontation threatens to blow the deal sky high. ?Move over, Carl Hiaasen! This brilliantly humourous romp through the ?real? Miami will have you howling with laughter and booking your trip to South Beach. You?re gonna love it!? ?Michael Levin, author of Soft Target
$23.98
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Landmark StatusLandmark Status careens madly through a subtropical tangle of legal actions, spirits, spells, kung fu, car wrecks, football, phobias, fetishes, wooden flutes, pet rabbits and vintage aircraft, whilst the fate of Miami?s famed Century Club hangs in the balance. Once a notorious nightspot, the Club just awoke from decades of slumbering decay?thanks to a local building boom. Now everybody?s scrambling to bury it under a fabulous high-rise. Lawyer Benjy Bluestone couldn?t care less, but a client owns the Club and seeks his help. It gets easier to say yes when he learns that beautiful broker Delia Torres is involved, even though she represents a developer who?s furious to find the Club?s been optioned to a rival. Benjy and Delia soon discover her client will stop at nothing to turn that option into ?something so ugly the tide won?t take it out.? Racing the clock, they join forces on the road to Opa-locka, where a violent confrontation threatens to blow the deal sky high. ?Move over, Carl Hiaasen! This brilliantly humourous romp through the ?real? Miami will have you howling with laughter and booking your trip to South Beach. You?re gonna love it!? ?Michael Levin, author of Soft Target
$32.98
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Personalized Nautical Tide ClockObserve your favorite United States coastal waterway whilst checking the tide with this Hand-crafted nautical clock.
$119.00
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CELES COMPCT BAROMETRIC WEATHER STATION@@ Temperature - displays indoor and outdoor in either F or C @@ Humidity - displays indoor with inbuilt hygrometer @@ Weather Forecast - indication of current weather and atmospheric pressure shown with inbuilt barometer @@ Clock - digital quartz for accurate time @@ Calendar - displays month, day, day of week @@ Alert - minimum and maximum for indoor and outdoor temperature @@ Moon Phase @@ Tide - current information displayed @@ Alarm Clock - with snooze @@ two AA Batteries needed for Receiver (user supplied) @@ two AA Batteries needed for Sensor (user supplied) @@ Receiver Weight: 8 ounces (227g) @@ Receiver Size: 3.8 x 2.5 x 6.7 (97mm x 64mm x 170mm)
$39.95
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Snap Circuits GreenLearning about environmentally friendly energy and electricity becomes a snap with the Snap Circuits Green Electricity Kit from Elenco! The color-coded, step-by-step, full-color manual of over 100 pages included in the Snap Circuits Green Electricity Kit supplies instructions on how to build over 125 energy efficient projects that introduce alternative energy sources. In addition to the experiments, this Snap Circuits Green Electricity Kit includes an educational manual that teaches about alternative energy forms, including geothermal, hydrogen fuel cells, wind, solar, tidal, hydropower, and others. The Color-coding in the Snap Circuits Green Electricity Kit manual matches the color-coded plastic parts, like a hand crank, a solar cell, an energy compartment, and a wind turbine, making it simple for kids to build eco-friendly experiments and model. Kids will learn to think green as they use the hand crank to power an FM radio, recharge a battery or power a clock, which are just some of the many experiments that the Elenco Snap Circuits Green Electricity Kit gives kids the opportunity to build and power in an eco-friendly way! Contains over 40 parts and features a hand crank, solar cell, FM Radio, energy compartment, rechargeable battery, windmill, clock and analog meter.
$69.98
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Boating
and Sailing Gifts
Anniversary
clocks
Harry Potter clocks at Broomsticks and Owls
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