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Old 07-26-2011
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Hear in hawaii you can see the green flash probably 30% of all sunsets that occur over water (not land). What you need is no clouds where the sun is setting and a very clear visability (which hawaii normally has). Also it helps to be at an elevation of at least 20 feet above the earth or water surface (deck of a cruise ship works well). The higher up you are it seems to work better- I live at elevation 400feet and regularly see the green flash. Best to not look directly at the sun until it is just ready to entirely slip below the horozion. Then, for a split second just after the entire sun is gone you will see a speck of green for a split secon- the green flash. I could see how a plane flying west at a high altitude would extend the time of the green flash- it is extending the time of the sunset time.
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