According to Mr Howland it is only possible to walk to the tower during the Spring and Autumn low tides and people should not attempt to reach it on their own.
Yangzhou, where Marco Polo once served as a municipal official, has a history of 2, 500 years, dating back to the Spring and Autumn Period in China (771 to 403 BC) when it was called Guangling.
Summer is peak tourist season, but planning a wine tour in the spring and autumn means avoiding the crowds and observing either the first leaves and shoots or witnessing the harvest, with grapes hanging ripe and heavy on the vine.
Men who are horse- and mule-packers during the spring, summer and early autumn have little or no employment in the off-season.
Imagine us as Australians, though, and the hyperborean blast must mean a heatwave scorching over from Java's scented isle, just as (though neither actually happens) Father Christmas should arrive half-clad on waterskis, and Easter should recall, to anthropologists, not the Adonis festival and the rebirth of spring but some autumn feast that has lost its way, or why not?
But the number of primary school pupils in England missing school without permission in the autumn term of 2009 and spring term of 2010 has risen slightly.
Continue along Pontocho, past the theatre where geisha perform public dances in autumn and spring, and you will come out near the river again and Sanjo Bridge, where much of young Kyoto is hastening towards a night on the town, or waiting for dates near the temple commemorating 39 noblewomen and children executed along the riverbank.
The plan for Nottingham is that from 2013, children would return to school in late August after a month-long break and then have a two-week break in the autumn, at Christmas, in spring and in late May.
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They follow a seasonal pattern reflecting the academic year, with lower rates in the autumn followed by a gradual rise in spring and early summer to a peak in late summer.
Visitors enter the park via a broad, pebbled avenue lined with twin rows of gingko trees, considered by many to be one of the most beautiful sights in the capital, especially in the autumn when golden leaves cover the path and in spring when the trees turn a fresh green.
"I ... would like to remind people that in 1918 the Spanish flu showed a surge in the spring, and then disappeared in the summer months, only to return in the autumn of 1918 with a vengeance, " Hartl said.
There was more effect from smoke in the autumn and winter than in spring and summer.
Department for Education figures show 0.51% of half-days were missed in the autumn term of 2009 and spring term of 2010 because of family holidays.
"The branch has been identified as one that could potentially be partnered with a retailer between the autumn of this year and spring of 2015, with any change being subject to a six week public consultation to gather the views of the local community, " said a spokesperson for the Post Office.
While the summer is the obvious time to head to the beach, there is something sublime about the crisp sea air on a spring or autumn day when the sands are empty save for the occasional dog walker and jogger.
Last autumn, and again in the spring, China was briefly a net exporter of steel.
It grows during autumn and winter and shrinks in the spring and summer.
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Lima beans were a staple in my mother's New England kitchen, bridging the span between autumn's bounty and the harvest of spring vegetables.
It is performed during spring and autumn ceremonies to worship Meng Chang, the god of music, at weddings and funerals, and during joyful festivities in courtyards, markets and the streets.
In the autumn of 2009, a group of progressive Cold Spring inhabitants got together and formed the Full Moon Project an attempt to counter the new P.
An outline version of the Wales Infrastructure Investment Plan will be published in Spring 2012, with a full version in Autumn 2012 and from then it will be updated quarterly.
The New Zealand, Polish and Danish versions of the show will make their debut this spring, with the Belgian version following this autumn.
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It may not be able to do much more than elect a new president whose first job would be to dissolve parliament and call elections at the earliest in July, but much more likely in the autumn or perhaps spring.
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