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| rdfs:comment | - The green flash is a phenomenon that, according to Prunella, supposedly occurs every year at midnight on New Year's Day. In "Arthur's New Year's Eve," she asks Arthur if he's going to stay up to watch this, but he doesn't understand. She realizes that he's never stayed up until midnight on New Year's Eve before, and therefore doesn't know about the green flash. She explains that every year at midnight, people gather to watch the sky for a most amazing green flash. If it happens, it means that the new year has successfully begun. If it does not happen, then it has to stay the same year for another whole year.
- Green Flash was the term given to rare optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible for a short period of time above the sun, or a green ray shoots up from the sunset point. According to Pirate Lore, it was a flash that shoots up into the sky at the last glimpse of sunset, signaling the return of a soul from the world of the dead, or trying to get back from Davy Jones' Locker.
- The reason for a green flash lies in refraction of light (as in a prism) in the atmosphere: light moves more slowly in the lower, denser air than in the thinner air above, so sunlight rays follow paths that curve slightly, in the same direction as the curvature of the Earth. Higher frequency light (green/blue) curves more than lower frequency light (red/orange), so green/blue rays from the upper limb of the setting sun remain visible after the red rays are obstructed by the curvature of the earth.
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| abstract | - The green flash is a phenomenon that, according to Prunella, supposedly occurs every year at midnight on New Year's Day. In "Arthur's New Year's Eve," she asks Arthur if he's going to stay up to watch this, but he doesn't understand. She realizes that he's never stayed up until midnight on New Year's Eve before, and therefore doesn't know about the green flash. She explains that every year at midnight, people gather to watch the sky for a most amazing green flash. If it happens, it means that the new year has successfully begun. If it does not happen, then it has to stay the same year for another whole year.
- The reason for a green flash lies in refraction of light (as in a prism) in the atmosphere: light moves more slowly in the lower, denser air than in the thinner air above, so sunlight rays follow paths that curve slightly, in the same direction as the curvature of the Earth. Higher frequency light (green/blue) curves more than lower frequency light (red/orange), so green/blue rays from the upper limb of the setting sun remain visible after the red rays are obstructed by the curvature of the earth. Green flashes are enhanced by mirage, which increase the density gradient in the atmosphere, and therefore increase refraction. A green flash is more likely to be seen in clear air, when more of the light from the setting sun reaches the observer without being scattered. We might expect to see a blue flash, but the blue is preferentially scattered out of our line of sight and remaining light ends up looking green. With slight magnification a green rim on the top limb of the solar disk can be seen on most clear-day sunsets. However the flash or ray effects require a stronger layering of the atmosphere and a mirage which serves to magnify the green for a fraction of a second to a couple of seconds.
- Green Flash was the term given to rare optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible for a short period of time above the sun, or a green ray shoots up from the sunset point. According to Pirate Lore, it was a flash that shoots up into the sky at the last glimpse of sunset, signaling the return of a soul from the world of the dead, or trying to get back from Davy Jones' Locker.
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