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"I don't know, exactly there's one rub. Another is that I haven't even started the transmitter and receptor units. But we've got some field-generators here on board that I can use, so it won't be so bad. And our comet is in this part of the solar system somewhere fairly close. Wish we had an Ephemeris, a couple of I-P solar charts, and a real telescope."
The time at which the moon's shadow passed a given point near Norfolk during the total eclipse of May 29, 1900, was only about seven seconds different from the time given in the Astronomical Ephemeris.
They would find it far better to buy an ephemeris referred to the meridian of Greenwich than to attempt to use their own The northern nations, I think, have all begun to refer to the meridian of Greenwich, and the same thing is happily true of our own marine.
The preceding are the principal astronomical and nautical ephemerides of the world, but there are a number of minor publications, of the same class, of which I cannot pretend to give a complete list. Among them is the Portuguese Astronomical Ephemeris for the meridian of the University of Coimbra, prepared for Portuguese navigators.
Phobar pondered long over this last news item and turned his attention to the outermost planet on the succeeding night. To his surprise, he had great difficulty in locating it. The ephemeris was of absolutely no use. When he did locate Neptune after a brief search, he discovered it more than eighty million miles from its scheduled place! This was at one-forty.
The books that still remained on the enervated table were an odd volume of Braithwaite’s Retrospect, a treatise on Human Physiology, and another on Materia Medica; a number of bound volumes of Zadkiel’s Astronomical Ephemeris, Raphael’s Prophetic Almanac, Raphael’s Prophetic Messenger, and a file of Robert White’s Celestial Atlas, running back to 1808.
"You can't do much without an Ephemeris, I should think. It's a good thing you kept the chronometers going. You know the I-P time, day, and dates, anyway." "I'll have to do without some things, that's all," and the man stared absently at the steel wall. "I remember something about its orbit, since it is one thing that all I-P vessels have to steer clear of.
"And how many mistresses, Sherbrooke?" demanded his father. "None, my lord," replied Sherbrooke. Not a change came over Lord Byerdale's countenance; but ringing the bell which stood before him on the table, he said to the servant, "Bring me the book marked 'Ephemeris' from my dressing-room, with a pen and ink.
When, after a few years of experience, methods were well established and a routine adopted, the office was removed to Washington, where it has since remained. The work of preparing the ephemeris has, with experience, been reduced to a matter of routine which may be continued indefinitely, with occasional changes in methods and data, and improvements to meet the increasing wants of investigators.
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