Even though I've found a lot about green flashes, there are many open questions. Maybe you know the answer to one of these; or maybe something here might jog your memory, and you could come up with a clue. If so, please send me email.
NOTE: Boldface links here are to the monster bibliography file, which takes a long time to load. Please be patient if you follow a link!
Is there a Verne scholar out there who has even a clue about this? Note that French astronomer Jacques Crovisier has a website devoted to Verne's astronomical background, with a page (in French) devoted to this particular question. He's as puzzled as I am.
Groff's claim is widely hailed in the green-flash literature; but, at the time it was published, it was contested by Daressy. Though Daressy stumbled badly in his misunderstanding of green flashes, his arguments with respect to the use of color by the ancient Egyptians might still be right.
I have been unable to find a modern Egyptologist who will offer an authoritative judgment in this dispute. Granted that Groff's physical arguments about green flashes are correct, how valid are his linguistic ones?
In an editorial in Monthly Weather Review 33, 408 (1905), there is the statement that
... the green ray seen just as the last glimpse of the sun disappears below the sea horizon was originally introduced into meteorology by Tyndall as an evidence of the special absorptive power of the aqueous vapor in the lowest layer of the atmosphere.
I'm unable to locate anything this might refer to. Did John Tyndall in fact ever suggest any such thing?
It's true that Tyndall did a lot of work on the absorption of water vapor; but all his papers I've seen say it is transparent to visible light. Furthermore, the phrase “last glimpse” is a direct quote from Joule's pioneering paper. Could the editor have got these two British physicists mixed up?
Dean Newman put me onto the couplet
which he remembers one character in a novel reciting to another at the rail of a ship — but he cannot recall where. Can anyone identify the source?
Glimpse you e'er the green ray,
count the morrow a fine day,
But when her letter was reprinted in Q. J. Roy. Met. Soc., the duration mysteriously became “quite one to two seconds.”
Who changed the number — and why?
Oh? Care to cite a reference? Where did this idea come from? Has anyone out there ever heard of this before? Let's hear when some of those “many occasions” actually occurred!
I have actually found one such reference: a letter by Brett Hilder (1951), entitled “Longitude by the green flash.” Are there any others?
Was there really a 1665 Rome edition, or is Pogg. just confused?
In addition, Humboldt offers the Sanskrit phrase “mriga-trichna' ” as meaning the mirage of the desert. Again, an actual example or two would be very welcome!
Who is the mysterious "C. Mostyn" who used the pseudonym "Treadle" in numerous letters to English Mechanic? He seems to be the first person to have noticed the connection between shipboard green flashes and the distortions due to inferior mirages. He served on “the old Macquarie, now  a training-ship for officers under Lord Brassey's scheme.” His last publication was in 1906, when he lived in Tunbridge Wells. He used his own name in his 1891 letter to Nature, but adopted "Treadle" a decade later in letters to E.M. And why did he pick the pseudonym "Treadle"?
According to Eric Hutton, who has been scanning the English Mechanic:
He was a Welshman, his main hobby was not astronomy but using a microscope. He bought his first microscope in 1858. In the 1860's he was a member of the Microscopical Society later to become the Royal Microscopical Society, but he quit this on leaving the UK. He also tells us in 1864 he owned the fourth 'bone-shaker' (an early type of early bicycle) to be built in the UK, and has rode almost every type of bicycle and tricycle built. Often doing journeys of over 100 miles. His last letter I can find in EM dates to 1919. He also ran a business for 10 years (I don't know what or where, but once I have some of the earlier volumes of EM digitised this may become apparent).
Any additional information about this perceptive GF observer would be very welcome!
Another author I'd like to see identified is the gentleman who signed his extraordinarily informative letter to T.P's Weekly simply “Another Engineer Officer.” Sometimes, when someone in a family has made such a contribution in print, the event is remembered by his descendants. Does anyone recall a great-uncle or the like who wrote such a letter?
Then, there's the incredibly stubborn R. Claude Cann Lippincott, who defended the notion of afterimages long after it should have been laid to rest. I cannot find him in Who's Who, nor does he seem to have been a member of the British Astronomical Association. Yet, at one point, the editor of Symons's Meteorological Magazine sounds as if he might be a known member of the British meteorological community — perhaps an avid amateur observer. Did Lippincott ever publish on any other subject? Had he any sort of technical training, or was he simply a fool with an inexhaustible supply of paper and ink?
I'd like to see a reference to this work, so I can add it to the "dip" file. Ainslie's account makes it sound interesting, but I have not found the original.
So far as I know, a real “Green Ray” has never been photographed. As the green ray is usually several times larger than the Sun itself, even an ordinary camera should be able to capture this phenomenon. There might be someone out there with an unpublished photo that shows it.
Maybe, as often happens, the picture came out yellow instead of green; that's a common problem in GF photography, owing to the bleaching of the retina that makes sunset flashes look green even at the yellow stage. Even such a “spoiled” photograph would be scientifically useful, however. If you have such a picture, I'd like to see a copy.
In his Ars Magna Lucis et Umbrae, Athanasius Kircher says that mirages or Fata Morganas are mentioned by a couple of ancient authors. One is Pomponius Mela, who supposedly says they are seen in Mauretania. (I have looked at all of Mela's references to Mauretania, but not found anything that could be construed as a mirage report.) Anybody have any idea what Kircher might have had in mind?
Likewise, Kircher says that Pliny reports that there is a region in Scythia where the figures of men and beasts are seen in the air between the mountains. Presumably this refers to Pliny's Historia Naturalis, which would indeed be a likely place for mirages to be reported; but I have not been able to find the passage referred to. Is there someone out there familiar with Pliny who can point me to the correct passage?
Finally, there are some references I haven't been able to get. If you're near a good research library, maybe you could turn one or two of them up; please take a look and see.
© 1999 – 2007, 2012 Andrew T. Young