Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 191
the suns disc,one may see that it makes a slight notch in the suns depression.limb (as the edge of the disc is called). Thereforethe spot must be a depression below the grayish-whitesurface of the sun. The shape of the spot is like that ofa dinner plate, the bottom of the plate corresponding to 184…
Astronomy
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