These are the most frequently used words in this book.
across
added
aj
although
appeared
apr
april
au
aug
august
barnard
bright
bruhns
calculated
central
closest
coma
comet
condensation
date
dec
december
described
determined
diameter
diffuse
discovered
during
earth
elong
estimated
extended
eye
faint
feb
february
first
found
france
full
gave
germany
given
jan
january
jul
july
jun
june
last
length
long
magnitude
mar
march
marsden
may
mnras
moon
moonlight
naked
nebulosity
noted
nov
november
nucleus
observations
observatory
observed
obtained
oct
october
orbit
pa
parabolic
perihelion
period
positions
pp
refractor
reported
revealed
round
saw
schmidt
seen
sep
september
sky
small
star
sun
tail
time
toward
usa
v1964
visible
von
years