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Updated: May 21, 2025
It has, indeed, one of the most important properties of all substances, in that it can vibrate. This practically unknown thing is called ether. The first important observational work done by the ancients led them to perceive that there was a very characteristic difference between the planets and the fixed stars.
And then growing weary of so straight an habitation, it breaketh prison, and cometh out, a perfectly formed chicken. Despite this observational effort, Digby's experience with the embryo is quite limited, and his theory of development relates more to his philosophical stance than to the facts of development. Indeed, the theory he propounds is not necessarily consistent.
Hipparchus must have known of that measurement, since he quotes the work of Aristarchus in other fields. Had he now but repeated the experiment of Aristarchus, with his perfected instruments and his perhaps greater observational skill, he was in position to compute the actual distance of the sun in terms not merely of the moon's distance but of the earth's radius.
The science of character analysis by the observational method is based upon three very simple scientific truths: First, man's body is the product of evolution through countless ages, and is what it is to-day as the result of the combined effect upon it of heredity and environment.
Already we were feeling its attraction; from the control rooms came the report that our trajectory was disturbed by this new mass so near. "Better make your calculations now, Gregg," Blackstone urged. I cast up the rough elements from the observational instruments in the turret.
In a few years commenced the epoch-making work of Campbell, in the most refined and difficult problem of observational astronomy, that of the measurement of the motion of stars to or from us. Through the application of photography and minute attention to details, this work of the Lick Observatory almost immediately gained a position of preëminence, which it maintains to the present time.
At a certain period in the history of astronomical science, the assumption that the planets move in circles was true enough to serve the purpose of correlating such observations as were then possible; after Kepler, the assumption that they move in ellipses became true enough in regard to the state of observational astronomy at that time.
At that time, observational duty had been regarded more highly than now, and the place had been desirable for any single officer, though the married men had objected to being separated from their families by the many miles of frozen waste. But that had changed. Now, Outpost was the end of the line. The dilapidated surface quarters offered poor protection from the fierce cold.
It has often been said that the efficiency of a telescope depends to a great extent on "the man at the eye end." This is as true in the case of the moon as it is in other branches of observational astronomy. Observers, especially beginners, frequently fall into great error in failing to appreciate the true character of what they see.
I suspect that the apparent anticipation is simply an observational illusion, similar to the illusion of time-reversal experienced when it was first observed, though not realized, that positrons sometimes exceeded light-speed." "Why, that's what I've been saying all along!" Dandrik broke in. "The whole thing is an illusion, due "
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