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Old March 22nd, 2015, 12:41 PM   #31081
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Quote:
Originally Posted by bogdymol View Post
Today I did a 1 day trip to Graz (approx. 500 km both ways). There are so many tunnels on A9 so after I got back home I decided to check how many there are exactly. During todays's roadtrip I passed through 57 tunnels with a combined length of 78,8 km (top 3 longest tunnels had 10086 m, 8320 m and 5400 m). Quite a "tunnel" day
you must try A10 in Italy finally then you will fully enjoy in tunnels and will see that Austria is kinda mild.
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Old March 22nd, 2015, 12:54 PM   #31082
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SS36 between Colico and Lecco also has a huge amount of tunnels.
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Old March 22nd, 2015, 02:58 PM   #31083
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There are 131 (westbound) / 123 (eastbound) tunnels between the French border and Genova on A10, in Italy.

The total extension of tunnels on A10 is 50,3km westbound, 43,8km eastbound.

----------------

A12 between Rosignano and Genova has 68 tunnels northwestbound (35,8km).
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Old March 22nd, 2015, 03:56 PM   #31084
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Quote:
Originally Posted by ChrisZwolle View Post
SS36 between Colico and Lecco also has a huge amount of tunnels.
i had that one in my mind too, but i focused only on A roads

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Originally Posted by Suburbanist View Post
There are 131 (westbound) / 123 (eastbound) tunnels between the French border and Genova on A10, in Italy.
i passed there 2 times (actually 4 because all were return trips). 4th time i started counted them, but i got lost around 100
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Old March 22nd, 2015, 05:01 PM   #31085
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I went through all those tunnels on A10 and A12 in mid 2010.

Anyway, nothing will beat S56 in Shanxi, China. It only has a couple tunnels, but more than half of the lenght of this expressway is under ground.
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Old March 22nd, 2015, 06:37 PM   #31086
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A Question re: tides, equinox and eclipse

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Originally Posted by MattiG View Post
Yes. It is the time of super tides. The tidal range is always peaking close to new moon and full moon. The spring tides are highest close to equinoxes. The eclipse occurring at the same time increases the tidal range even more.

. . . . The strongest bores occur today and tomorrow.
I'd been aware of the high tides predicted for the year, since the full moon became so close to the winter solstice (Dec 2014), and they'll continue for most of this year's spring tides.
I expected that the position of both the sun and moon in such perfect alignment to produce an eclipse at the vernal equinox would also give us the biggest of 2015's spring tides (disregarding barometric pressure etc.). And I was almost correct. But only 'almost'. I was out by 1 or 2 days, and I don't understand why.

Why are the biggest tides on Sat 21st and Sun 22nd April, while the eclipse was on Fri 20th?
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Old March 22nd, 2015, 07:05 PM   #31087
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because of inertia. It requires some time for the enormous mass of the ocean to move
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Old March 22nd, 2015, 10:10 PM   #31088
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Quote:
Originally Posted by g.spinoza View Post
because of inertia. It requires some time for the enormous mass of the ocean to move
The tidal system and the Earth can be thought as a huge hydrodynamic clutch: Even if the angular velocities of the input and output shafts are equal, there is some phase difference. For tides, this lag is called 'tide age'. It varies by location, and it is about two days at the North Sea. Thus, the spring and neap tides occur two days after new/full moon and half moon, respectively.
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Old March 23rd, 2015, 12:07 AM   #31089
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i am definitely not missing that one in 2026 in Spain.
In 2027 there will be a long duration total eclipse with a peak in the Valley of the Kings, Luxor, Egypt.
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Old March 23rd, 2015, 12:23 AM   #31090
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Annular solar eclipses seem to be pretty cool as well.
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Old March 23rd, 2015, 12:26 AM   #31091
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Quote:
Originally Posted by g.spinoza View Post
because of inertia. It requires some time for the enormous mass of the ocean to move
Thanks.
I think I understand that.

But I'm still unclear about part of this.
There was no 'surprise' element to the aligniment - the tides had been building daily, as they do before every new moon. The enormous mass of ocean water was still managing to ebb and flow on every tide twice a day, and increasing the volume of that flow with every tide. Those vast volumes of water still managed to rise and fall for Saturday morning's high, but still the peak was to come on Sunday evening (tonight in NE England). What I'm struggling with is an inertial drag which defines the profile of a rising wave whose cycle is slower than the 12-hourly cycle of the tides.

Where did the causal energy arise, which moved a greater volume of sea movement between the exceptionally low tide this morning and the exceptionally high tide this evening; while the gravitational contribution of the moon had waned since Friday?

[I'm not challenging your reply - just struggling to reconcile it with what I understand about fluid dynamics and tides].

Quote:
Originally Posted by MattiG View Post
The tidal system and the Earth can be thought as a huge hydrodynamic clutch: Even if the angular velocities of the input and output shafts are equal, there is some phase difference. For tides, this lag is called 'tide age'. It varies by location, and it is about two days at the North Sea. Thus, the spring and neap tides occur two days after new/full moon and half moon, respectively.
Thank you. That appears to correspond with the observable facts. I still can't quite grasp a 'phase difference' whose full cycle is longer than a tidal cycle, but you've given me some 'handles' to research further.
I'm grateful.

Last edited by DXNewcastle; March 23rd, 2015 at 12:31 AM.
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Old March 23rd, 2015, 04:47 AM   #31092
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Looks like there was a total solar eclipse in 1990 in Estonia, but only in Tallinn.
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Old March 23rd, 2015, 10:07 PM   #31093
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Quote:
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In 2027 there will be a long duration total eclipse with a peak in the Valley of the Kings, Luxor, Egypt.
i'll rather chose Gibraltar for that one
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Old March 23rd, 2015, 10:51 PM   #31094
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Weather for Sahara in August in the middle of the day is certain to be sunny without clouds or morning fog. I wouldn't be so sure for Gibraltar in the morning though.
There will be also annular eclipse in Istanbul in 2030 in morning, that could also be spectacular in this amazing city.
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Old March 24th, 2015, 02:30 AM   #31095
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Old March 24th, 2015, 11:59 AM   #31096
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It seems the August 2026 eclipse will be just total in my hometown (the totality starts leaving towards Zaragoza!). I'd rather chose Ariza to see the eclipse, it will be exactly in the central line (and is also exactly halfway between my hometown and Madrid).
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Old March 24th, 2015, 05:05 PM   #31097
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Huesca will be almost entirely left out.
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Old March 24th, 2015, 07:03 PM   #31098
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Until the end of war. We were enemies to Hungary, but both allied with Germany
Yes, and Slovakia was only created as a German pupet state by the nazis to separate Poland from Hungary "1000 years old friendship" (the official day was yesterday) .
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Old March 24th, 2015, 11:34 PM   #31099
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Hola from Sevilla, Spain!
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Old March 25th, 2015, 01:45 AM   #31100
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BBC has just fired Jeremy Clarkson.

RIP Top Gear
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