Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
.—Light moves withsuch rapidity that its movement tiirough any distance, limited by thesurface of the earth, cannot be appreciated by our unaided senses. Itsvelocity was first determined about two hundred years ago, by theastronomer, Roemer; who observed that the occurrence of the eclipsesof… … earth rotates around the sun is indicated by an arrow, as also themotion of the satellite around the planet. As the earth moves from T, its nearest position to Jupiter, to S, itsmost remote position, the intervals between the consecutive eclipses ofthe satellite gradually grow longer; Avhilst in…
Physics · Astronomy
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