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Updated: May 31, 2025
'If this surmise be correct, Roemer reasoned, 'then as I approach Jupiter along the other side of the earth's orbit, the retardation ought to become gradually less, and when I reach the place of my first observation, there ought to be no retardation at all. He found this to be the case, and thus not only proved that light required time to pass through space, but also determined its rate of propagation.
The penetration of Roemer had previously detected irregularities in the observed times of the eclipses of Jupiter's satellites, which were undoubtedly due to the interval which light required for stretching across the interplanetary spaces. Bradley argued that as light can only travel with a certain speed, it may in a measure be regarded like the wind, which he noticed in the boat.
Roemer reasoned thus: 'Had I been able to remain at the other side of the earth's orbit, the moon might have appeared always at the proper instant; an observer placed there would probably have seen the moon 15 minutes ago, the retardation in my case being due to the fact that the light requires 15 minutes to travel from the place where my first observation was made to my present position.
Roemer Visscher, the youngest member of the triumvirate, was like Spiegel an Amsterdammer, a Catholic and a well-to-do merchant. His poetical efforts did not attain a high standard, though his epigrams, which were both witty and quaint, won for him from his contemporaries the name of the "Second Martial." Roemer Visscher's fame does not, however, rest chiefly upon his writings.
The coronation-day dawned at last on the 3d of April, 1764: the weather was favorable, and everybody was in motion. I, with several of my relations and friends, had been provided with a good place in one of the upper stories of the Roemer itself, where we might completely survey the whole.
I found my aunt somewhat worried because Miss Roemer had left the house immediately after our early dinner, and had not yet returned. We both knew the girl to be still grieving over her broken engagement, and we dreaded the effect this last dreadful news might have on her.
Bradley did this, and the 'aberration of light, as his discovery is called, enabled him to assign to it a velocity almost identical with that deduced by Roemer from a totally different method of observation.
The velocity of light, as determined by Roemer, is 192,500 miles in a second. For a time, however, the observations and reasonings of Roemer failed to produce conviction. They were doubted by Cassini, Fontenelle, and Hooke.
"That is very true, Miss Roemer. Still it is a queer incident and something that I must look into." "What do you believe?" asked the girl tensely. "I am not in a position to say as yet. When I am, I will come to you and tell you." "Then you do not think that my guardian killed John that there was a quarrel between the men?" "There is, of course, a possibility that it may have been so.
But more entertaining for the spectators was the hereditary carver, who came to fetch a piece of the roasted ox. He also rode, with a silver dish, through the barriers, to the large wooden kitchen, and came forth again with his portion covered, that he might go back to the Roemer. Now it was the turn of the hereditary cup- bearer, who rode to the fountain and fetched wine.
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