Abstract
IN the number of NATURE for June 12, p. 136, I see that you notice the results obtained in the last eclipse with the use of the spectroscope for determining the first entrance of the moon or planet. There seems, however, to be some confusion in the report. You say that I propose Respighi's method for first contact, and my own for the last. This is not the case. I propose the common Respighi method as useful for obtaining a first warning of the entrance of the planet on the chromosphere. This is the only use I think it possible to make of it. But the real entrance must be obtained by my method, in which one sees the disc of the sun as with a common glass, and the line of the chromosphere tangent to it, can be seen broken at the instant of contact, as the ring of Venus is broken at its exit from the solar disc.
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SECCHI, P. The Secchi and Respighi Methods. Nature 8, 162 (1873). https://doi.org/10.1038/008162c0
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DOI: https://doi.org/10.1038/008162c0
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