Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 75
ained by the discovery of the aberra-tion of light. Romers approximate determination ofthe time required by light in passing from the Sun tothe Earth was rather more than eleven minutes; butit is now known that when the Sun is at its meandistance, this interval is 498s (8m 18s), the… … isisi PHOTOTACHOMETER FOR MEASURING THE VELOCITY OF LIGHT {Viewfrom above) {Only in the latter half of the iglh century was the velocity of light first meas-ured with accuracy. The favorite method is that of the Revolving Mirror?inaugurated in 1862 by Foucault, the eminent French physicist (page…
Astronomy
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