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Why do we have two high tides a day when the moon just goes around once??? DaveJ
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Re: Check out the sun too.....pulls much g (nm)
Where does the wind go when it stops ?
Where does the wind go when it stops ?
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Immediately pulled from memory is the following:
At any given time, there are two high tides on the earth, the direct tide on the side facing the moon and the indirect tide on the opposite side. As the earth rotates on its axis, the location of the two diametrically opposed tidal bulges varies on the earth's surface. The earth's rotation and the moon's revolution, which have the same direction, bring each point on the earth opposite the moon once every 24 hr and 50 min. Therefore, the average interval between direct and indirect high tides is about 12 hr and 25 min. In many places along the Atlantic coasts of N America and Europe, the two daily low tides are of nearly equal duration and magnitude, called semidiurnal tides.
In certain shallow seas and narrow estuaries, the tides differ from this simple pattern. For example, in certain regions such as the Pacific coast of N America, one of the two daily tides is appreciably higher than the other or the interval between successive tides is unequal; these are called mixed tides. In other regions, such as the Gulf of Mexico, there is only one high tide per day called a diurnal tide, with a period of 24 hr and 50
I hope you're impressed!
Nick
At any given time, there are two high tides on the earth, the direct tide on the side facing the moon and the indirect tide on the opposite side. As the earth rotates on its axis, the location of the two diametrically opposed tidal bulges varies on the earth's surface. The earth's rotation and the moon's revolution, which have the same direction, bring each point on the earth opposite the moon once every 24 hr and 50 min. Therefore, the average interval between direct and indirect high tides is about 12 hr and 25 min. In many places along the Atlantic coasts of N America and Europe, the two daily low tides are of nearly equal duration and magnitude, called semidiurnal tides.
In certain shallow seas and narrow estuaries, the tides differ from this simple pattern. For example, in certain regions such as the Pacific coast of N America, one of the two daily tides is appreciably higher than the other or the interval between successive tides is unequal; these are called mixed tides. In other regions, such as the Gulf of Mexico, there is only one high tide per day called a diurnal tide, with a period of 24 hr and 50
I hope you're impressed!
Nick
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Nick said:
>>>At any given time, there are two high tides on the earth, the direct tide on the side facing the moon and the indirect tide on the opposite side. As the earth rotates on its axis, the location of the two diametrically opposed tidal bulges varies on the earth's surface. <<<<<
Pah!. This is obviously rubbish. We have two tides per day because the Earth is flat. All the water swills to one side when the moon comes up, and then swills back of its own accord when the moon goes down. Try it with a horizontal half-full pop bottle.
These 'round Earth' theories are pure claptrap. Just look at any Chart. All of them are FLAT!
Best
Sue
>>>At any given time, there are two high tides on the earth, the direct tide on the side facing the moon and the indirect tide on the opposite side. As the earth rotates on its axis, the location of the two diametrically opposed tidal bulges varies on the earth's surface. <<<<<
Pah!. This is obviously rubbish. We have two tides per day because the Earth is flat. All the water swills to one side when the moon comes up, and then swills back of its own accord when the moon goes down. Try it with a horizontal half-full pop bottle.
These 'round Earth' theories are pure claptrap. Just look at any Chart. All of them are FLAT!
Best
Sue
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Sorry Sue, you are wrong, wrong, wrong, the earth is definately round. I know this because my boat always goes faster coming downhill (north to south)
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Ah Nick..why then are there no tides in the Med. Should the water not be able to rush past the Straights of Gibralter just like the space we sail through to come into the Marina.The straights are much wider too so it should be easier to rush past
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Check out the sun too.....pulls much g (nm)
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Re: Check out the sun too.....pulls much g (nm)
9 minutes for your reply...what took you so long.
Sorry I don't buy the Sun thing because the tides are too regular and the sun and moon are not in daily phase
DaveJ
9 minutes for your reply...what took you so long.
Sorry I don't buy the Sun thing because the tides are too regular and the sun and moon are not in daily phase
DaveJ
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Nick, a fantastic explanation, but sorry I've tried to simulate both yours and Sue's explanation in the kitchen laboratory and Sue definately has it right. DaveJ
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Its obvious! In cosmic terms, the Mediterranean is a puddle - effectively an inland lake and is therefore less affected. It does have tides anyway even if they are 2" at neaps and 4" at springs.
So there!
Next!
So there!
Next!
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Re: Check out the sun too.....pulls much g (nm)
The Sun does exert a gravitational effect on tides. It's the relative phase of the Moon and Sun which causes the occurence of Spring and Neap tides
The Sun does exert a gravitational effect on tides. It's the relative phase of the Moon and Sun which causes the occurence of Spring and Neap tides
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See?
Told you so.....
;-)
Sue
Told you so.....
;-)
Sue
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