Next morning. Typical holiday weather. Temperature below freezing, a cutting wind, rain, mud, and a smell of naphthaline, because my maman has taken all her wraps out of her trunks. A devilish morning! It is the 7th of August, 1887, the date of the solar eclipse. I may here remark that at the time of an eclipse every one of us may, without special astronomical knowledge, be of the greatest service. Thus, for example, anyone of us can (1) take the measurement of the diameters of the sun and the moon; (2) sketch the corona of the sun; (3) take the temperature; (4) take observations of plants and animals during the eclipse; (5) note down his own impressions, and so on.
It is a matter of such exceptional importance that I lay aside the “Past and Future of the Dog Licence” and make up my mind to observe the eclipse.
We all get up very early, and I divide the work as follows: I am to measure the diameter of the sun and moon; the wounded officer is to sketch the corona; and the other observations are undertaken by Mashenka and the variegated young ladies.
We all meet together and wait.
“What is the cause of the eclipse?” asks Mashenka.
I reply: “A solar eclipse occurs when the moon, moving in the plane of the ecliptic, crosses the line joining the centres of the sun and the earth.”
“And what does the ecliptic mean?”
I explain. Mashenka listens attentively.
“Can one see through the smoked glass the line joining the centres of the sun and the earth?” she enquires.
I reply that this is only an imaginary line, drawn theoretically.