at 5 a.m o'clock

3

By E.L. Trouvelot, from Astronomical drawings: Atlas (via NYPL)

“The zodiacal light.” Observed February 20, 1876.

“Star cluster in Hercules.” From a study made in June, 1877.

“The November meteors.” As observed between midnight and 5 o'clock A.M. on the night of November 13-14 1868.