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Nothing in all the realm of astronomy impresses the imagination more than its enormous distances. Indeed, they are so vast that it is hardly credible that they can be measured at all.
The principle used by astronomers to determine them is exactly that of the range-finders employed by modern gunners. Bearings are taken on the distant target from two points as far apart as is practicable. Knowing the distance between these points, the distance of the target can be calculated from the difference of its bearing at the two points.
When we come to apply this method to the stars, we find that the whole diameter of the earth is far too short a base-line. Fortunately, we have a longer one available, the diameter of the earth's orbit. By taking observations of a star at properly chosen dates, six months apart, we have a base 186,000,000 miles long, and can proceed with some chance of success.
Enjoy 1 free Sentinel article or audio program each month, including content from 1898 to today.
A Present Help
The Basis of Healing
Arthur E. Jennings
An Honest Endorsement
An Important Distinction
Ezra W. Palmer
T. R. Hinsdale
The Saviour from all Ills
with contributions from Lloyd B. Coate, Martin F. Jackson, F. H. Leonard, Edward C. Butler, A. Willis Paine, Frank W. Gale, W. D. McCrackan
Henry Norris Russell with contributions from Ed.
with contributions from A. L. McBride, F. B. Brown, John A. Plummer, William Maxwell, Elmer McBurney
MRS. EDDY TAKES NO PATIENTS
There is no Refuge in Obscurity
W. with contributions from Joseph Wood, Wendell Phillips
A Personal Correspondence
with contributions from F. L., J. G. Ramsbottom
AGNES FLORIDA CHALMERS
"And if thou Strayest"
WILLIAM C. HENDERSON
J. W. K.
One of the things that chiefly impresses an American Christian...
with contributions from John O'Reilly
Among the Churches
with contributions from B. N. Weston, Nora C. Hargitt, Carrie McGill Dickens
When Christian Science was first brought to my notice
with contributions from Stephen A. Chase, Joseph Armstrong
with contributions from Frederick B. Mott, A. A. Berle, James J. Keevil, Gail Hamilton, Charles Kingsley, James Freeman Clarke, L. M. Child, J. R. Miller