These are known respectively as the Zodiacal Light and the gegenschein.
M. Quénisset notes that—as in the case of the Zodiacal Light—the southern border of the gegenschein is sharper than the northern.
The gegenschein is an extremely elusive phenomenon, suitable only for eyes that have been specially trained to see it.
Barnard finds that the gegenschein is not so faint as is generally supposed.
He must moreover sign with his own hand the so-called «gegenschein» (Counter-certificate) to be found in the deposit book.