Edmond Halley Quotes

In the year 1456 ... a Comet was seen passing Retrograde between the Earth and the sun... Hence I dare venture to foretell, that it will return again in the year 1758.

Aristotle's opinion... that comets were nothing else than sublunary vapors or airy meteors... prevailed so far amongst the Greeks, that this sublimest part of astronomy lay altogether neglected; since none could think it worthwhile to observe, and to give an account of the wandering and uncertain paths of vapours floating in the Ether.

One of the better early attempts at dating the planet came from the ever-reliable Edmond Halley, who in 1715 suggested that if you divided the total amount of salt in the world’s seas by the amount added each year, you would get the number of years that the oceans had been in existence, which would give you a rough idea of Earth’s age.

Halley had become England’s second astronomer royal in 1720, after John Flamsteed’s death. The puritanical Flamsteed had reason to roll over in his grave at this development, since in life he had denounced Halley for drinking brandy and swearing “like a sea-captain.” And of course Flamsteed never forgave Halley, or his accomplice Newton, for pilfering the star catalogs and publishing them against his will. Well liked by most, kind to his inferiors, Halley ran the observatory with a sense of humor. He added immeasurably to the luster of the place with his observations of the moon and his discovery of the proper motion of the stars—even if it’s true what they say about the night he and Peter the Great cavorted like a couple of schoolboys and took turns pushing each other through hedges in a wheelbarrow.

largest Globular Cluster in our Galaxy and contains approximately ten million stars. The English astronomer Edmond Halley was the first to officially classify Omega Centauri as a “non-stellar object.” Before the invention of the telescope Omega Centauri was classified as a star. Omega Centauri through a telescope This star cluster has been a subject of debate after astronomers found evidence of a black hole in its center. However, an updated measurement of star velocities within this cluster challenges these original observations. I’ll definitely look forward to following this story as Omega Centauri undergoes further observation. You can find Omega Centauri by forming a triangle between the Southern Cross and the bright star Rigel Kent (also known as Alpha Centauri). Difficulty: 2 Supernovae

In the early 1680s, at just about the time that Edmond Halley and his friends Christopher Wren and Robert Hooke were settling down in a London coffee house and embarking on the casual wager that would result eventually in Isaac Newton’s Principia, Hemy Cavendish’s weighing of the Earth, and many of the other inspired and commendable undertakings that have occupied us for much of the past four hundred pages, a rather less desirable milestone was being passed on the island of Mauritius, far out in the Indian Ocean some eight hundred miles off the east coast of Madagascar. There, some forgotten sailor or sailor’s pet was harrying to death the last of the dodos, the famously flightless bird whose dim but trusting nature and lack of leggy zip made it a rather irresistible target for bored young tars on shore leave. Millions of years of peaceful isolation had not prepared it for the erratic and deeply unnerving behavior of human beings. We don’t know precisely the circumstances, or even year, attending the last moments of the last dodo, so we don’t know which arrived first a world that contained a Principia or one that had no dodos, but we do know that they happened at more or less the same time. You would be hard pressed, I would submit to find a better pairing of occurrences to illustrate the divine and felonious nature of the human being-a species of organism that is capable of unpicking the deepest secrets of the heavens while at the same time pounding into extinction, for no purpose at all, a creature that never did us any harm and wasn’t even remotely capable of understanding what we were doing to it as we did it. Indeed, dodos were so spectacularly short on insight it is reported, that if you wished to find all the dodos in a vicinity you had only to catch one and set it to squawking, and all the others would waddle along to see what was up. The indignities to the poor dodo didn’t end quite there. In 1755, some seventy years after the last dodo’s death, the director of the Ashmolean Museum in Oxford decided that the institution’s stuffed dodo was becoming unpleasantly musty and ordered it tossed on a bonfire. This was a surprising decision as it was by this time the only dodo in existence, stuffed or otherwise. A passing employee, aghast tried to rescue the bird but could save only its head and part of one limb. As a result of this and other departures from common sense, we are not now entirely sure what a living dodo was like. We possess much less information than most people suppose-a handful of crude descriptions by "unscientific voyagers, three or four oil paintings, and a few scattered osseous fragments," in the somewhat aggrieved words of the nineteenth century naturalist H. E. Strickland. As Strickland wistfully observed, we have more physical evidence of some ancient sea monsters and lumbering saurapods than we do of a bird that lived into modern times and required nothing of us to survive except our absence. So what is known of the dodo is this: it lived on Mauritius, was plump but not tasty, and was the biggest-ever member of the pigeon family, though by quite what margin is unknown as its weight was never accurately recorded. Extrapolations from Strickland’s "osseous fragments" and the Ashmolean’s modest remains show that it was a little over two and a half feet tall and about the same distance from beak tip to backside. Being flightless, it nested on the ground, leaving its eggs and chicks tragically easy prey for pigs, dogs, and monkeys brought to the island by outsiders. It was probably extinct by 1683 and was most certainly gone by 1693. Beyond that we know almost nothing except of course that we will not see its like again. We know nothing of its reproductive habits and diet, where it ranged, what sounds it made in tranquility or alarm. We don’t possess a single dodo egg. From beginning to end our acquaintance with animate dodos lasted just seventy years.