Now showing items 1-10 of 87
Experimental Proofs of the Earth’s Rotation
First Paragraph: | In establishing the truth of the Copernican system, professors of astronomy are apt to look upon Foucault’s pendulum as the one experimental proof of the earth’s diurnal rotation. They may also possibly ...
Dates of Easter for Two Thousand Years
First Paragraph: | Whenever we take up the calendar of a new year our first inquiry is concerning the date of Easter, since its position regulates the dates of all the movable feasts of the year. This is as it ought to be.
The Driving Clock and the Clamp and Slow-Motion Screw of an Equatorial
First Paragraph: | Providing an equatorial telescope with an efficient driving clock, and bringing the clamp and slow-motion screws on both axes down to the eyepiece, appear to be so exclusively the work of a professional ...
Is Newton’s Theory of Gravity All Wrong
First Paragraph: | In these days of unrest, when the alignment of nations, no less than their own internal machinery, is so seriously threatened with disarrangement that the established order of thousands of years runs ...
Cuspidal Envelope Rosettes
First Paragraph: | A point P moves in the line segment EG, Fig. 1, with simple harmonic motion of p cycles, while this segment makes q revolutions about A with uniform angular speed. Moritz has exhaustively treated the ...
The Demon Star
First Paragraph | In the northern heavens, visible in the United States on almost any night of the year, there is a famous star that the Arabians named Al Gol, the Demon Star. While all the myriads of fixed stars glowed ...
Stereoscopic Harmonic Curves
First Paragraph | All professors of physics are fond of harmonic curves. Many even seem to consider it a duty, as far as their circumstances permit, at one time or another to construct a machine and draw some of these ...
That Dreadful Tail
First Paragraph | The predicted passage of the earth through the tail of Halley’s comet on the night of May 18 seems still to fill many anxious minds with dread. Its absolute harmlessness cannot, therefore, be emphasized ...
The Total Eclipse of the Moon of 1917 December 28 - The Total Eclipse of the Sun of 1918 June 8 as Visible in the United States
THE TOTAL ECLIPSE OF THE MOON | The eclipse of December 28 next is exceptional in that, (1) it is the seventh and last eclipse of this year,—seven being the greatest possible number that can occur in a year;—(2) it is the ...
The Columbus Eclipse
First Paragraph: | In Windsor's “Christopher Columbus” on page 465 the following incident is related. | “Columbus now resorted to an expedient characteristic of the ingenious fertility of his mind. His astronomical tables ...