Copenhagen cycles Originally uploaded by seadipper . Although it was high tide when we went to swim this morning, we still had a long walk across the beach to get to the water. This is because today the tides are in their Neap phases, and there is only a 2 metre range between high and low water. In two weeks' time, we will be back to Spring tides and the range will be over six metres. Everything is cyclic. Anyone who spends a lot of time out of doors or is involved with the sea will know this. The seasons, and the tides, for instance, are all cyclic. The sun rises and sets once every 24 hours. The tides come round roughly twice every 25 hours. Twice a month the tides cycle from Springs to Neaps. And this variation in tides changes with the seasons, and with other factors due to the inclination of the orbits of the earth and the moon. Then there is the 11 year sunspot cycle, which seems to have an effect on the weather. All these changes have astronomical causes. There are some ver...
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