Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 244
r all points withinthe umbra; within the penumbra the eclipse is partial; ifonly the prolongation of the shadow cone encounters theearth the eclipse is annular for all points touched successively by the axis of the shadow. 169. Speed of Light from the Eclipse of JupitersSatellites (T., 43; B.,… … NATURE AND PROPAGATION OF LIGHT. 233 though, since it is really a gradual phenomenon, any oneobservation is doubtful to half a minute. In 1676 Roemer, a Danish astronomer, an observer at thetime in the Paris Observatory, discovered that the observedeclipses differ systematically from the computed…
Physics
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